A tool device for forming a joint between a composite skirt and a composite dome disposed within and joined to an inner surface of the composite skirt, comprising: a cylindrical skirt tool shell on which composite plies may be laid up to form the composite skirt, the cylindrical skirt tool shell including an outer surface intersecting a surface of the composite dome; wherein the tool further comprises: a generally cylindrical spacer connected with the cylindrical skirt tool shell and filling at least a portion of a gap between the composite dome and the composite skirt, the generally cylindrical spacer being configured to be positioned, in use, just outboard of a tangent point where the composite skirt meets the composite dome; wherein the generally cylindrical spacer comprises a plurality of tool blocks arranged side-by-side around a circumference of the tool device, the tool device having an outer cylindrical surface configured to extend in use from the tangent point on the composite dome; wherein the cylindrical skirt tool shell further includes a circumferentially extending flange on one end thereof opposite the generally cylindrical spacer; and wherein the cylindrical skirt tool shell comprises an outer mold line dictated by an inner mold line geometry of the composite skirt. a cylindrical skirt tool shell on which composite plies may be laid up to form the composite skirt, the cylindrical skirt tool shell including an outer surface intersecting a surface of the composite dome; wherein the tool further comprises: a generally cylindrical spacer connected with the cylindrical skirt tool shell and filling at least a portion of a gap between the composite dome and the composite skirt, the generally cylindrical spacer being configured to be positioned, in use, just outboard of a tangent point where the composite skirt meets the composite dome; wherein the generally cylindrical spacer comprises a plurality of tool blocks arranged side-by-side around a circumference of the tool device, the tool device having an outer cylindrical surface configured to extend in use from the tangent point on the composite dome; wherein the cylindrical skirt tool shell further includes a circumferentially extending flange on one end thereof opposite the generally cylindrical spacer; and wherein the cylindrical skirt tool shell comprises an outer mold line dictated by an inner mold line geometry of the composite skirt. a generally cylindrical spacer connected with the cylindrical skirt tool shell and filling at least a portion of a gap between the composite dome and the composite skirt, the generally cylindrical spacer being configured to be positioned, in use, just outboard of a tangent point where the composite skirt meets the composite dome; wherein the generally cylindrical spacer comprises a plurality of tool blocks arranged side-by-side around a circumference of the tool device, the tool device having an outer cylindrical surface configured to extend in use from the tangent point on the composite dome; wherein the cylindrical skirt tool shell further includes a circumferentially extending flange on one end thereof opposite the generally cylindrical spacer; and wherein the cylindrical skirt tool shell comprises an outer mold line dictated by an inner mold line geometry of the composite skirt.