Still glue, but try some goop. Like rubber cement so you can pry parts apart if used lightly. Or you could try some rare earth magnets, but will need to then use a ferrous metal screw for it to attract to. You'll have to measure the inside cavity of the wheel to see what would fit.

http://www.lowes.com/pd_48915-1149-140231_0__

http://www.rare-earth-magnets.com/magcraft-nsn0601