G'day Mudrock,
Firstly, can we confirm we are talking about the transmission drive clutches on the drive pulleys adjacent the rear axle and not the clutch at the engine.
If it's the transmission clutches they are supposed to be cork. The overlaying material has been put there in a Dad and Dave repair job. There are several threads discussing the setup of these clutches. That said, they are dead simple.
If it's the engine clutch your talking about be aware they are an asbestos material. I've replaced one of mine with cork on an abandoned restoration project. Moderator Gadge points out, quite rightly, in another thread that this was probably not a good idea and that I should have used a high speed clutch material. I've not put the cork one to the test but I think he is right.
Hope this helps,
Cheers,
Last edited by prd; 24/11/16 06:29 AM.