Had to replace the corks last week the tank having sat empty for some the corks had dried out, the spares I had soaking were the originals out of the bike and had not got better so sent for some new corks which arrived today, pulled the tank into the middle of my bench to change the plungers (spare one now equipped with the new cork) ha only to find the ones in there had now swelled and worked fine, so there you go got spare corks at least.
Now then anyone know what size and thread the little set screws are that hold the plunger in or if available anywhere, the ones I have are odd, I think one might be original but the other is definitely not.
Just tidying things up a bit while I'm onit