Thanks captain , helped a lot 👍  couple of tips to anyone if it helps.... I bought a pack of 6 cork floor tiles  $13 Aussie... I then used a block of timber around 100mm x 100mm x 15mm softwood, outlined the size of cork I needed to sand down, nailed how ever many nails 30mm x 1.6mm brading nails I needed to hold the piece of cork, in my case 5, one inside each corner & 1 in the middle, set the depth of the nails to the thickness I needed this held the cork while I sanded it until I reached the tip of the nails...  Worked a treat
Hope this helps anyone. 👍

I use to boil new clutch corks go in realy easy and rock solid once cooled
Got this tip from Barry Ladlow of Laceby he sold british bike parts and repaired them he had sign over counter saying " please do not ask for japanese spares as a fist in the gob often offends "  . Was aladdin's cave for british spares but  parts inventory management left lot to be desired

Thanks for sharing your skills. I know you can buy the corks but this woukld certainly help if you needed them to ride tomorrow.

Awesome..