I use 5 minute epoxy. put some on both the rod tip and inside the tube with a toothpick.
Be sure you get all the surfaces wet with epoxy then slide the tip on. Don't rely on the epoxy from one part spreading to the other. I put enough inside the tube such that some sqirts out the end when slid onto the tip.
Also be sure to clean the rod beore applying the epoxy. i use acetone damp on a wrag. not sopping wet , just enough to wipe off any surface film.
By now , after 4 attempts , there's probably lots of crap on the tip. you may need to lightly sand with 400-600 grit before the next attempt.
I've been lucky and never had a problem this way. I gave up on hot melt for just the reasons you are describing.
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