The factory studs are swaged in place after insertion. The CSM tells you to use a cutter tool to machine this swaged part off BEFORE pressing the stud out. Obviously your shop didn’t do this, which is why the hole is now oversized. Simply page through the Dorman catalog and you’ll find studs with larger splines that fit the oversize hole. I did this on my 62 when I converted the driver side studs to RH thread.