I have a robot which is called drrobotshop rover i have built it but its very hard to get the threads on it i dont know if i did something wrong but if you put it on it does not run.
Check that the Tamiya gearbox was assembled in configuration C. Normally when the tracks are too tight, it’s been assembled in A or B.
I think I have lost the paper is there a online version of config c
You can see a video showing the assembly of the gearbox (and the rest of the rover) here: youtube.com/watch?v=MWWoEul9Qsk
The printed manual was included in the gearbox kit. We do not have an online version at this time.