Document:

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                                                                   EXHIBIT 10.34

                            AMENDMENT NO. 1 TO LEASE

     THIS AMENDMENT NO. 1 TO LEASE ("Amendment") is made as of the 1st day of
May 2001, by and between ST. PAUL PROPERTIES, INC., a Delaware corporation
("Landlord") and ATS Medical, Inc., a Minnesota corporation ("Tenant").

                               W I T N E S S E T H

     WHEREAS, Landlord and Tenant entered into that certain Lease Agreement
dated April 29, 2000 (the "Lease") for the premises located at 3800 Annapolis
Lane North, Suite 175, Plymouth, MN; and

     WHEREAS, the parties wish to amend the Lease to reflect certain additional
agreements between them,

     NOW, THEREFORE, for good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, Landlord and Tenant agree as
follows:

     1. Defined Terms. Unless the context otherwise indicates, all capitalized
terms not otherwise defined herein shall have the meanings ascribed to them in
the Lease.

     2. Amendment: Effective on the date hereof,

          (a)  The parties desire to extend the term of the Lease for an
               additional two (2) years, commencing August 1, 2006 and expiring
               July 31, 2008 ("Extension Term").

          (b)  The Base Rent during the Extension Term shall be $5.32 per square
               foot, $10,159.35 per month, $121,912.20 annually.

          (c)  Article 30 of the Lease, Right to Renew Lease, shall be modified
               so that the renewal right be for a 5-year term, rather than a
               3-year term. All other terms and conditions of this Article 30
               shall remain in force and effect.

     3. No Default. Tenant represents and warrants that after giving effect to
the amendment contained herein, no Event of Default shall have occurred or be
continuing under the Lease and no event shall have occurred which, with the
serving of notice or the passage of time, shall mature into such an Event of
Default.

     4.   Reference to and Effect on the Lease.

          (a)  Upon the effectiveness of this Amendment, each reference in the
               Lease to "this Lease", "hereunder", "hereof", "herein" or words
               of like import referring to the Lease shall mean and be a
               reference to the Lease as amended hereby.

          (b)  Except as specifically set forth above, the Lease remains in full
               force and effect and is hereby ratified and confirmed.

          (c)  Wherever there exists a conflict between this Amendment and the
               Lease, the provisions of this Amendment shall control.

     5. Governing Law. This Amendment shall be governed by and construed in
accordance with the laws of the State of Minnesota.

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     6. Headings. Section headings in this Amendment are included herein for
convenience of reference only and shall not constitute a part of this Amendment
for any other purpose.

     7. Counterparts. This Amendment may be executed in counterparts, all of
which, when taken together, shall constitute one and the same original.

IN WITNESS WHEREOF, this Amendment has been executed as of the date written
below:

ST. PAUL PROPERTIES, INC.                    ATS MEDICAL, INC.

By:  /s/ Michael D. Elnicky                  By:  /s/ Richard W. Kramp
     --------------------------------             ------------------------------
     Its:   Asset Manager                         Its:   President/COO
     Date:  May 14, 2001                          Date:  May 3, 2001<PAGE>
        THIRD SUPPLEMENTAL INDENTURE, dated as of May 25, 2000 (the
        "Supplemental Indenture"), among T.O. HAAS TIRE COMPANY, INC.,
        a Nebraska corporation ("Haas Tire"), T.O. HAAS HOLDING CO.,
        INC., a Nebraska corporation ("T.O. Haas Holding") (Haas Tire
        and T.O. Haas Holding collectively referred to as the "New
        Subsidiary Guarantors"), HEAFNER TIRE GROUP, INC. (f/k/a The
        J.H. Heafner Company, Inc.), a Delaware corporation (the
        "Company"), each other existing Subsidiary Guarantor under the
        Indenture referred to below, and FIRST UNION NATIONAL BANK, a
        national banking association, as trustee (the "Trustee") under
        the Indenture referred to below.

                                   WITNESSETH:

         WHEREAS, the Company, the then existing Subsidiary Guarantors and the
Trustee have heretofore executed and delivered an Indenture, dated as of
December 1, 1998, as supplemented by that certain Supplemental Indenture, dated
as of February 22, 1999, as further supplemented by that certain Second
Supplemental Indenture, dated as of May 14, 1999 (as further amended,
supplemented, waived or otherwise modified, collectively, the "Indenture"),
providing for the issuance of an aggregate principal amount of $150 million of
Series D 10% Senior Notes due 2008 of the Company (the "Securities");

         WHEREAS, Section 4.12 of the Indenture provides that the Company is
required to cause each domestic Restricted Subsidiary (other than an Immaterial
Subsidiary that is neither a borrower nor a guarantor under the Credit Facility)
to execute and deliver to the Trustee a Guaranty Agreement pursuant to which
such Restricted Subsidiary will Guarantee payment of the Securities on the same
terms and conditions as those set forth in Article 10 of the Indenture;

         WHEREAS, the Company is causing each of the New Subsidiary Guarantors
to execute this Supplemental Indenture in order to comply with the terms of
Section 4.12 of the Indenture and each of the New Subsidiary Guarantors intends
thereby to become bound as a Subsidiary Guarantor; and

         WHEREAS, pursuant to Section 9.01 of the Indenture, the Trustee, the
existing Subsidiary Guarantors and the Company are authorized to execute and
deliver this Supplemental Indenture amending the Indenture, without the consent
of any Holder (as defined in the Indenture);

         NOW, THEREFORE, in consideration of the foregoing and for other good
and valuable consideration, the receipt of which is hereby acknowledged, the New
Subsidiary Guarantors, the Company, the existing Subsidiary Guarantors and the
Trustee

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mutually covenant and agree for the equal and ratable benefit of the holders of
the Securities as follows:

                                    ARTICLE I

                                   Definitions

         SECTION 1.1       Defined Terms. As used in this Supplemental
Indenture, terms defined in the Indenture or in the preamble or recital hereto
are used herein as therein defined, except that the term "Holders" in this
Supplemental Indenture shall refer to the term "Holders" as defined in the
Indenture and the Trustee acting on behalf or for the benefit of such Holders.
The words "herein," "hereof" and "hereby" and other words of similar import used
in this Supplemental Indenture refer to this Supplemental Indenture as a whole
and not to any particular section hereof.

                                   ARTICLE II

                        Agreement to be Bound; Guarantee

         SECTION 2.1       Agreement to be Bound. Each New Subsidiary Guarantor
hereby becomes a party to the Indenture as a Subsidiary Guarantor and as such
will have all of the rights and be subject to all of the obligations and
agreements of a Subsidiary Guarantor under the Indenture. The New Subsidiary
Guarantors agree to be bound by all of the provisions of the Indenture
applicable to a Subsidiary Guarantor and to perform all of the obligations and
agreements of a Subsidiary Guarantor under the Indenture.

         SECTION 2.2       Guarantee. The New Subsidiary Guarantors hereby
fully, unconditionally and irrevocably guarantee, jointly and severally with
each other Subsidiary Guarantor, to each Holder of the Securities and the
Trustee and its successors and assigns, the full and punctual payment when due,
whether at maturity, by acceleration, by redemption or otherwise and within
applicable grace periods, of the Obligations pursuant to Article 10 of the
Indenture and on the same terms and conditions of the Indenture.

                                   ARTICLE III

                                  Miscellaneous

         SECTION 3.1       Notices. All notices and other communications to the
New Subsidiary Guarantors shall be given as provided in Section 11.02 of the
Indenture.

         SECTION 3.2       Parties. Nothing expressed or mentioned herein is
intended or shall be construed to give any Person, firm or corporation, other
than the Holders and the Trustee, any legal or equitable right, remedy or claim
under or in respect of this Supplemental Indenture or the Indenture or any
provision herein or therein contained.

                                       2
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         Section 3.3       Governing Law. This Supplemental Indenture shall be
governed by the laws of the State of New York, but without giving effect to
applicable principles of conflicts of law to the extent that the application of
the laws of another jurisdiction would be required thereby.

         Section 3.4       Severability Clause. In case any provision in this
Supplemental Indenture shall be invalid, illegal or unenforceable, the validity,
legality and enforceability of the remaining provisions shall not in any way be
affected or impaired thereby and such provision shall be ineffective only to the
extent of such invalidity, illegality or unenforceability.

         Section 3.5       Ratification of Indenture; Supplemental Indenture
Part of Indenture. Except as expressly supplemented hereby, the Indenture is in
all respects ratified and confirmed and all the terms, conditions and provisions
thereof shall remain in full force and effect. This Supplemental Indenture shall
form a part of the Indenture for all purposes, and every Holder of Securities
heretofore or hereafter authenticated and delivered shall be bound hereby. The
Trustee makes no representation or warranty as to the validity or sufficiency of
this Supplemental Indenture.

         Section 3.6       Counterparts. The parties hereto may sign one or more
copies of this Supplemental Indenture in counterparts, all of which together
shall constitute one and the same agreement.

         Section 3.7       Headings. The headings of the Articles and the
sections in this Supplemental Indenture are for convenience of reference only
and shall not be deemed to alter or affect the meaning or interpretation of any
provisions hereof.

                                       3
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         IN WITNESS WHEREOF, the parties hereto have caused this Supplemental
Indenture to be duly executed as of the date first above written.

                             HEAFNER TIRE GROUP, INC.

                             By:  /s/ Donald C. Roof
                                  ------------------------------------------
                                  Name: Donald C. Roof
                                  Title: President & Chief Executive Officer

                             T.O. HAAS TIRE GROUP, INC.,
                                  as a New Subsidiary Guarantor

                             By:  /s/ Donald C. Roof
                                  ------------------------------------------
                                  Name: Donald C. Roof
                                  Title: CEO

                             By:  /s/ J. Michael Gaither
                                  ------------------------------------------
                                  Name: J. Michael Gaither
                                  Title: Vice President

                             T.O. HAAS HOLDING CO., INC.,
                                  as a New Subsidiary Guarantor

                             By:  /s/ Donald C. Roof
                                  ------------------------------------------
                                  Name: Donald C. Roof
                                  Title: CEO

                             By:  /s/ J. Michael Gaither
                                  ------------------------------------------
                                  Name: J. Michael Gaither
                                  Title: Vice President

                                       4
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                             CALIFORNIA TIRE COMPANY,
                                  as a Subsidiary Guarantor

                             By:  /s/ Donald C. Roof
                                  ------------------------------------------
                                  Name: Donald C. Roof
                                  Title:Chairman

                             By:  /s/ J. Michael Gaither
                                  ------------------------------------------
                                  Name: J. Michael Gaither
                                  Title: Vice President

                             WINSTON TIRE COMPANY,
                                  as a Subsidiary Guarantor

                             By:  /s/ Donald C. Roof
                                  ------------------------------------------
                                  Name: Donald C. Roof
                                  Title: Chairman

                             By:  /s/ J. Michael Gaither
                                  ------------------------------------------
                                  Name: J. Michael Gaither
                                  Title: Vice President

                             THE SPEED MERCHANT, INC.,
                                  as a Subsidiary Guarantor

                             By:  /s/ Donald C. Roof
                                  ------------------------------------------
                                  Name: Donald C. Roof
                                  Title: Chairman

                             By:  /s/ J. Michael Gaither
                                  ------------------------------------------
                                  Name: J. Michael Gaither
                                  Title: Vice President

                             FIRST UNION NATIONAL BANK,
                                   as Trustee

                             By:  /s/ Shannon Schwartz
                                  ------------------------------------------
                                     Name:  Shannon Schwartz
                                     Title: Vice President

                                       5

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