Interested. The original gasket was slightly thinner, but that was before I cranked it down. I didn't notice a channel, but it also just fell apart. Did you mean a channel in the gasket or the part itself?

When I dropped this motor back in I threw in the leaky slave with no gasket. Didn't want to spend more until I saw some good readings. When I pulled it, the leaky fluid came with it. I opened the inspection plate and a little dropped out.

My clutch is not new, and need to be careful about this gasket when I replace it maybe.

I'll mic my gasket material when I get home. It's pretty thick. But let me know.