I'm working on an ST300 transmission. I have found the clutch piston cushions almost impossible to find. I purchased Viton material of the proper thickness and laser cut new cushions. I added about 1/16th of an inch to the height thinking there was probably some shrinkage/wear/compression on the old cushion. After I reassembled the forward clutch, I inserted the shaft and tried to turn the clutch hub. I couldn't turn it by hand. I wondered if anyone has any experience with knowing how tight this thing should be with new clutches and steels. I didn't think 1/16 of an inch would be enough to apply pressure on the clutches. Is this kind of tension normal due to the new clutch drive plates? I was able to purchase a NOS forward clutch piston and cushion recently and may have to exchange to verify if no one has experience with this issue. appreciate any help I can get. Thx