I'll give the thumbs up to JB weld.
It's very strong - it will crack given enough of a shock - but we are talking significant hammer blows. It's thick and doesn't run much if at all.
On the other hand could you do the Ego feedneck mod ?
I did it recently and it was a POP.
Guide:
epoxy flooring phoenix
I just used a Dremel , large file, 400 grit. Took about 2 hours.