[modelman]

Hi jim-as a non-machinist, all I can tell you is practice, practice, practice and learn all you can. Looks like you are off to a good start. One thing I can say I learned about the tracks. The pin placement in the track pads is critical to getting the correct pitch. I would say make several track pads and assemble them and see if they have the correct pitch around the sprocket. On my shovel the pitch was different with the pads laying flat than when it was wrapped around the sprocket and I never got it exactly right. Just experiment and work it out. Good luck Tom