I just checked the spare clutch plate I have had since I got my 1933 Chevrolet in 1971.
The one side of each rivet is deep that presses against the metal plate sandwiched between the two friction surfaces. The other side of each rivet that holds the friction material to the metal is shallow and they alternate back and forth between each side so here is how I measured the depth.
First I put a thick feeler gauge over the friction material and measure the total thickness of the plate and feeler with a micrometer, then I moved the micrometer over the rivet and measured from the feeler on one side to the top of the shallow rivet on the other. Subtracted the two numbers and came up with .050"
As a check when I put a .020" and .030" feelers together and look at the thickness it appears to be approximately the same as the rivet head depth also.
Rivet head depth is .050" on the new clutch plate.
Last edited by Vila; 06/17/17 09:41 AM.