Hi Sh2006,
Well I've just had a look at one of the wrecks I have on hand and it confirms what I thought all along, the transfer shaft does not protrude into the casting as I thought and as such I just can't work out how that scoring has occurred when really that's where the PTO shaft from the engine is situated.
Regardless I would purchase another clutch body as they do have a use by date when they are in service for a length of time.
Cheers,
BB.