A non-permanent glue might be OK if used sparingly but you don't want to get any in the works or have it strong enough that you will mangle the dial if you need to take it off to repair something like the keyless. Dial-Dots are extremely sticky but allow the dial to move around a bit as they are pretty soft so care must be taken to not disturb orientation when casing the movement. Another alternative would be the double-stick tape used by trophy shops to stick the little brass plaques on trophies. It is thin, strong, and rather firm.