My new-old stock gast rotart vane pump just died. I though it broke a
shear pin as only the motor was still spinning. I know, it makes no sense
to have a have shear pin in a small tabletop style pressure/vacuum pump.

Apparently the rotor was held to the motor shaft with some sort of
loctite, at least according to the manual and it broke free. The shaft is
round and nearly polished, same for the bore of the rotor. The service
manual says sent it to a repair depot and never mess with the rotor.
Forget that.

What's the best loctite to attach the 1/2" shaft to the about 2.5"
diameter rotor? They will be wet at all times with light motor oil, and
the runnning temp is too hot to touch for more than a few seconds. I've
not used loctite under those conditions.

The stuff that broke free looks slightly yellow, like 5 minute epoxy of
some type.

It just seems like real cheap, ****ty design to me. I've never seen the
inside of pump held together with glue.