I am not able to get the flange bearings onto the threaded shafts in part 2 of the robot tank.
It appears the shaft diameters are too large, or the flange bearing openings are too small.
Would it be possible to get replacements for either or both of these parts?
I had the same problem with mine. I was able to use a small socket and tap it down onto the shaft with a hammer. In my case, the ends of the slot cut in the end of the shaft could have probably been filed a little to allow it to slide on easier. Once I got the bearing past the slot, it slid the rest of the way normally.