Quoted from Pin_Guy:
The coil mounting holes in the original VUK were oval (slotted) so that the positioning can be adjusted, if firing too hard, move it down a little and if too weak move it up a little. there is only a little wiggle room here, but after a couple position adjustments mine works flawlessly (original coil).
Rebuilding a flipper is one of the easiest things to do, I would just do it; you dont even have to desolder the coil, just let it hang by the wires.
Thanks for the tips! I moved the eject VUK up and now it's too strong. Going to do some fine tuning and it will be 100%.
Did the flipper rebuilds. 1 hour for the first one, 30 minutes for the second, and 15 minutes for the third. Just takes a little practice. WOW! I had no idea how dirty those things were, and it's like having new flippers! The ball screams up the ramp now. I now know how to fix weak flippers, and will be rebuilding flippers on a few games going forward.
Thanks again for the tips!