Hi Jon Lemay,
Are they standard or carbon fibre. Do like Steve Carr just said for both types,but some times the backing plate on the aluminium hub requires thicknessing with a file as the are punched out before bonding to the carbon fibre. But I only use the standard now since finding out that the are fibre impregnated plastic also and they are very well balanced from the factory and don't lift the heat in your motors like the after market ones. Johnno Hennessy.
Keep flying on the green side of the grass.