Im converting my zenoah 23 to electronic ignition will use 1/8x1/8 magnet in prop hub,do I make press fit or bond or both ,what kind of glue?

I make a slip and flush fit and use JB weld. Never had one come loose yet. Good luck, red

The JB Weld is the glue that everyone uses

Whatever you do . . . do not heat up the magnet or strike it directly with a hammer

Most people stake the sides of the magnet hole with a punch or some device to make the metal tight around the magnet after installation
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I have never had one fall out. I have used CA, Loctite bearing glue, and JB. I have staked them and not. If you use lube on the drill bit degrease the hole after. The only frustration I have had is using a hole that is too snug. If you have a 1/8" magnent and drill a 1/8" hole a thick glue like JB will not ooze past easily enough. If you have some air in the hole the magnent will pop back out. I have found it works out to to use about a #30 bit with a magnent that is truely 1/8". That will give about 1 1/2 thousands all around for the glue to excape. A press fit is bad. These magnents are very fragile and hard. Heat will kill them too. Think about that before you decide to glue a prop hub on with JB weld. Taking one out is a chor. Diamond dental bits will cut them.