Earlier I had posted a file for a Williams kickout hole protector. Then I found out that there is more than one size kickout hole on Williams games (EM games specifically). So I designed two more protectors and here are the files for you guys to use:
NOTE: I printed these out and fit them into playfield holes, but my playfield is stripped of parts so I haven't given them the final test.
http://www.thingiverse.com/thing:1460562
http://www.thingiverse.com/thing:1460226
Alan