I'm experimenting with clutches right now. No washers and washers and different shoes. I believe I found a shoe that I really like and will most likely be running this season. I want a little more time on it though before I give full praise and also see how it holds up to a mod motor. As for shims, find the Ofna clutch shim kit, it's goes for about $4 and has every damn shim you can think of.