My little bit of installation advice is to put your flywheel nut on the bike and slightly over tighten the nut than factory specs call for.
Remove the nut and pretty sure the washer, then install the weight using the tool, then tighten the set screws just a little.
loosen the set screws and take the flywheel weight off, now look at the flywheel were the set screws tighten and make sure that they are fully seating on the center hub part of the flywheel, its really hard to explain until you actually install one to see what I mean. I am almost sure we had to remove the washer to allow the set screws to grab better on to the center hub's edge.
Over tightening the factory nut and removing it before installing the weight helps seat the flywheel real good so you do not shear a flywheel key.