Powerhouse Products stud boss cutting tools include a universal arbor that also acts as a pilot/guide and fits into the original stud hole. When switching over your factory heads for screw-in studs, you need to machine down the stud boss equal to the thickness of the new stud's jam nut plus the guideplate thickness.

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Powerhouse Spring Seat Cutter for 1.580 OD.

Powerhouse Spring Seat Cutter for 1.580 OD.

$218.25