@Herman - I've never been that interested in the modern MBT's (models that is, I love the real thing). But after getting this I think I'll get some more. Just something about the size and how menacing it looks.
Anyway back to the build-
Decided to add bearings to the drive shafts. The biggest problem is that by fitting bearings to the hull of the tank it makes it difficult to get the gearboxes out so I've made removable bearing housings that slot into a fixed mount-
You can just about see the grey mount inside-
There are four bearings (with spacers) in the housing. The end is sealed so the don't come out.-
The housing sticks out a bit (but not so it fouls the sprocket) which'll help take the strain.
Took it out for a test spin (video to follow) and it works great. It's still got the nylon gears (still breaking in the metal ones) and was surprised how well the did. They ran faultlessly and didn't skip once in about 30 mins running around. I even had it doing 360's on carpet with out any problems apart from losing the odd track pad every now and again.