JDAugie, it took a bit to get the magnetic tape flat, What I did was press them for a week or so between two 1" thick block of steel. I got my machine set for a nickel, my kids complained too much about charging a quarter.
Her's some good pinball DYI sites and forums note: they aren't as nice & friendly as SMC
http://www.pinrepair.com/begin/index.htmhttp://pinside.com/pinball/forum/Your pin has a Williams System 6 mpU, here's some links for those MPU's http://pinball.flippers.info/system6resources.asp
http://www.pinrepair.com/sys37/good for parts:
http://www.pbresource.com/index.html