Balance Issues

[warp9.9]

What is the purpose for the cush drives, i'm looking to get a hub made for the rocket and i'm not sure if bst used them on their wheels when they did their design. I know on my m109r rc components used had me used them.

to absorb the intial shock to the rm when power is applied. It is a batch of rubber spacers in the wheel for cushion. without it the metal to ,etal will soung like two shovels clanging right up until failure occurs!!!!