Not sure James if i could find 0.125mm
But for aluminium foil, i've think to try it.
When i'll recieve the adapter next week, i'll try to wrap something around the axle to remove any slop.

My crt.5 is ridiculously fast and powerfull with the MMM/Neu 1515 2200Kv and 5s with 1/10 truck tire, so i can't imagine what it'll do with 1/8 badland tires on it