I did a huge amount of work to my machine - here is what happened to the playfield when I removed all of the plastics and parts:
Needless to say I had to make a new playfield and top for the running horses track.
I actually put up a bit of a repair log page but didn't document the running horses mechanism for some reason??
http://homepin.com/winner.html
I also have all the files if you want to make stencils to repaint the cab.
Mike - I just read your write up. The way you manufactured everything (coils, motor etc) certainly lead up to what you are doing now with Thunderbirds - but on a much larger scale !
The game turned out really nice.
