Craig J,

The alloy 1.5 degree rear hubs on the MO5 Pro kit have a lot more play,(side to side movement) than the standard kit 2 degree rear hubs. The shimming of these is better for the bearings, just remember not to place in too many shims otherwise the axle will be tight when you mount the wheel hub, wheel and tighten. The best is to add one or two shims reassemble and then mount wheel and then check for movement, keep going until acceptable.

The standard kit parts are normally not that loose. I should have included this in my explanation.

Regards,

Calvin.