Thanks JP, I did do a rebuild kit for the clutch master many years ago, and I know all too well what a joy it is to bleed the clutch. Didn't have a burning urge to try another rebuild kit right now, but I'll hang on to it and see if it can be rebuilt again. Might be moving in the next few months and I was shooting for driveable over authentic. Moss refers to two different master cylinders, one identified by a groove near the flange. Would this groove be inside the pedal box when installed, or on the reservoir side? I have a small raised line on the reservoir side, but trying to figure out if that's the "groove" they are talking about. I don't remember what kit I had, it was probably 13 years ago when I rebuilt it.