Stripped as in the bolt is gone and the threads are messed up??
Or broken off in the hole?
If stripped, you could carefully chase the threads with a tap but I would not want to torque it back to spec as that's what probably caused it to strip in the first place.
If bolt is broken off in the hole. best to take it to a machine shop and have them drill, tap and helicoil for a proper repair.
I WOULD NOT try to use a hand drill to accomplish this repair. and wind up breaking off a bit or worse yet a tap in the hole and then you really will be shafted.
The block needs to be secured on a mill table, indicated and machined square and plumb to affect a proper repair IMHO.
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