Quoted from Jgaltr56:
I plan on removing the wheels, putting the mylar down, then carefully cutting around the inside of the wheel holes with a new blade. I have not removed the wheels yet. Is that a big deal?
I have found that removing the wheels is pretty easy. Actually this machine is one of the easiest I have ever worked on. (3 cheers to Heighway for excellent design.) However it is a bit tedious trying to level the wheels when you are reinstalling them. Also you should take care when reinstalling to make sure your screw is contacting a flat part of the shaft when you reinstall them.
Ultimately what worked best for me was to use a small level on the playfield to push the wheel against when reinstalling. This is a bit confusing as I read it so I will try to make my point a little clearer.
If you have a helper have them hold the flat edge (small level in my case) across the middle of the wheel hole.
Then you come at the wheel from under the playfield and with one hand hold the wheel so it is against the straight edge and with the other tighten the screw.
If you don't have a helper you can install the wheel so it is snug but not tight against the the motor shaft. Then using the straight edge push the wheel down to the right height (may need to work on the correct snugness that will hold the wheel in place but also allow for it to be moved) then carefully tighten the screw the rest of the way. Since the wheel is a bit loose on the shaft make sure that when you are tightening the screw you don't tilt the angle of the wheel. When you are done you want the wheel to be flush with the playfield all the way around.