I had thought about going with an M6 bolt but was hoping to keep them all the same. Timesert shows they have a bigsert that is designed to repair when a helicoil pulls out...but they don't show one for a 12-24...everything but that? I will contact them tomorrow to see if by chance they have one that will work.

BradH...do you remember where you got the M6 bolt you used?