Grafting feedscrew (Q from a new guy)

[f350ca]

Check the corner of one of the teeth with a file, they probably aren't hardened. If you apply the heat to the bored out sleeve quickly, as in large hot flame the gear should stay fairly cool anyway. Had a look at the specs on Loctite 640, they say its for shrink fits, but must be referring to warming a bearing or housing in oil, its flash point is 200F.