Still no sign of the Rebound piston rings But i would like to pick your brains on this web site where the Showa forks appear to have a 25mm piston ring.
Have a look your comments would be appreciated, I may even buy some to try for the sake of £12 a pair. Even if i have to buy the piston itself it may just work in the shivers.
http://www.k-tech.uk.com/product_detail.php?id=2413