I ended up breaking one of the Anderson blue squidgy urethane wheels by tearing the hub out of it during testing, so I ended up having to make a few mods to fix it.

The original wheel.

How it failed

Looking to fix the issue by squishing the wheel between two plates.

And fitted back on the robot

 

I tidied up a couple of odds and sods and bolted the hoopty thing on and called it a day.