choppa,

Those track pads in the photo are obviously made following directions I once drew up for a 'Tech Tips' article, several years ago. I had the same problem, and wanted to use an HG-68 in parades on public streets. The 1&quot; conveyor belt was the material I used, as I recall I also made some examples of what could be done with wood, though not as durable, it will work. You might check to see if that back issue is still available. Another option is, since that time, Zimmerman's has found what appears to be trailer bumpers that they sell for this purpose, this has become popular, and is a bolt up solution to this problem.
Take care, 
Andy