globalrider
Alps Adventurer
Here are the new housings with the magnet retainers.
I noticed that Valeo mod when I went to Euro MotoElectrics to check on the parts I needed.
Back in the mid 90s when magnets becoming unglued from their motor housings was as common as anything, I wondered why they didn't angle the edges of the magnets and then have a wedge hold them to the motor housing with small screws. Valeo's mod is another solution and admission to an issue they had.
Actually, the magnet issue back then wasn't due to the glue letting go, but the magnet breaking away from the motor housing. It broke away due to vibration, at least in the magnet failure on my airhead. The magnet curvature had a radius smaller than the radius of the motor housing. That meant that the edges of the magnets were not making contact with the motor housing and with a thin smear of glue along the center of the magnet, the edges were even more elevated. Vibration caused a rocking and breakage of the magnet (my motor housing had a thin layer magnet material still attached to it with a thin smear of grey glue under it).
Valeo had a slightly different designed magnet that they used in the starter motors of Saturn cars (the motor housing from them could be used in our starters) where the edges of the magnets (the edge sitting against the motor housing) were raised, thereby creating a thin gap under the magnet which was gap filled with glue.
As for adhesives, Henkel - Loctite has/had a couple of them specifically made for magnets used in electric motors. Note their gap fill limitation. Loctite 392 is one of them.