flywheel weight

I located a ZipTy racing 10 oz flywheel weight for my yz400f on ebay, but it doesnt include instructions. Is anyone here familiar with installing these (yes I know its an 18 year old bike) or by some stroke of luck, have install instructions still laying around?  Im guessing the flywheel gets removed, drilled and tapped.  I'm just not sure it a spacer is required on the cover afterward.   Any help would be appreciated.  I contacted ZipTy racing but didnt hear back.  thanks

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