Hello,,

it may be common knowledge but i only just saw that biggred do a seal kit for the 25mm master cylinder, i know a lot of people (even lately) saying they've changed to 23/22mm master cyls due to being unable to rebuild the 25mm ,

hopefully this helps,

http://www.ebay.co.uk/itm/3114491051...%3AMEBIDX%3AIT