First RC model - Buldozer

I like the tanks, but as General George Smith Patton said. "When I have a choice between tank and bulldozer, I always choose a bulldozer." So the bulldozer ....

http://www.rcmania.cz/viewtopic.php?f=29&t=85027

When I saw Jirka doing a great tank with his son, this series inspired me. Thank you very much for inspiration and I would like to have more inspiring contributions.
http://www.rcmania.cz/viewtopic.php?f=29&t=84748&start=15#p1431806


I was already a favorite bulldozer on two 9g servos on Thingiverse https://www.thingiverse.com/thing:16234
But I wanted the standard servos machine. I'm even sure I've seen some sort of adjustment, but I have not found it.

The original idea was to make a little bit bigger to get thousands of edges from the standard servos on the drive wheel. A couple of attempts and benchmarks are set at 118%.
A test print of the belt members showed the need for adjustments. Extend the belt so that I do not need to fit every item to the exact size an