Patent ID: 7544042

Claim:
An impeller assembly comprising: a molded impeller; an insert within the impeller; and a blind bore extending generally axially from an end of the insert, the blind bore including an unthreaded portion extending from an open end of the blind bore to an intermediate location between the open end and a closed end of the blind bore, and a threaded portion extending from the intermediate location toward the closed end of the blind bore, the unthreaded portion of the blind bore having an unthreaded interior surface and a shoulder adjacent the threaded portion, the unthreaded interior surface having a diameter greater than a diameter of the threaded portion, the unthreaded portion being sized and shaped to receive a positioning pin of a mold for positioning the insert in the mold, wherein the shoulder includes a non-planar surface and a planar contact surface for contacting a tip of the positioning pin when the pin is received in the blind bore, the contact surface being spaced radially from the unthreaded interior surface by the non-planar surface and lying in a plane extending lateral to the bore axis.