Thrasher Modular Pulley System on the Eaton M62 Supercharger. Components are pulley, hub, screws and custom-made aluminum spacer. Unlike the M90 Supercharger found on the supercharged Series II 3800 engine where the pulley has a tapered hole and is held on with a high pressure press fit, the M62 uses a key and key-way with a large nut to hold the pulley in place. There are modular pulley systems available for the M90 but nothing available for the M62 so what I did is use a hub and pulley that are meant for the Magnuson replacement M90 Nose Drive which uses the key and key-way system, so the hub fits right on the M62 supercharger, then with the custom-made aluminum spacer between the hub and pulley to position the pulley correctly so the supercharger drive belt lines up, and longer-than-normal screws to attach the pulley (thru holes in the spacer) to the hub, the system comes together. The theory is to be able to change to a different size pulley without having to use any special pulley-pulling tools. But this is the only pulley I have for the system and it is the smallest size currently available.