I had one smc rr axleclutch. Very well engineered! There are a few issues with them.
I strongly recommend that you contact Mark Schoonover in Wisconsin. He is a great guy…very experienced! And he is truly an SMC expert! He has knowledge of the clutch and lots of parts! Just the guy you need to look at your clutch!
I have heard of the pin bolt issue.
If Mark cant help..nobody can.
Hope this helps,
Ron