Figured this out. The wheel dial is actually two pieces snapped together that hide a screw into the motor hub. Gently pry the dial piece apart along the split (hard to see) to release the snap tab, then can remove the hidden screw to remove the dial.
The "wobble" appears to have been that the screw hadn't been touched in a while and needed tightening.
As to the flourescents, best to take the motor off the back and gently wedge them in there.
Surprised that I couldn't find a Bally manual anywhere that showed this, would think that would have been helpful info. I'm not a slot tech, but know my way around pinball machines well, and still couldn't figure this out for the life of me.