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Vintage Schumacher drive castle to 12mm hex adaptor, allowing use of modern wheels on vintage buggys. To suit 6mm deep hex. Suits Schumacher Cat / Procat / Bosscat / Topcat / Cougar / Cougar 2 / Storm / Shotgun. To select variant required measure depth of wheel hex. If in doubt, use thicker variant. Note - Item includes main drive adaptor and screw cup, joined with 3 easily removable posts. Before use, bore of main drive adaptor will need manually enlarging to 3mm. Dependant on material, flats of adaptor may require gentle sanding to achieve close fit with wheel hex. 4WD cars and 2WD rears will require M3 X 25mm long cap head screws. 2WD fronts will require M3 X 20mm long cap head screws.