Please go ahead with pictures and explanation of what you do Geoff, especially when it comes to setting up the shim stack so that you get the right amount of clutch clearance. That should complement aldot's explanation that he is going to supply. He didn't need to replace his clutch facings, but Murray did, and has posted something about how he did it in this thread:
https://www.outdoorking-forum.com.au/forum/ubbthreads.php?ubb=showflat&Number=20076&page=2

He explained how he removed the old facing with a knife, then softened the glue with petrol and wiped it off, so there wasn't much risk of damaging the disk.