Funny you should mention scores in the cylinder wall... Like you I replaced my seals with Jack's toolkit, all was well for a few weeks, then, hello again, I was getting water shooting out of the top of the right group again when I pulled the lever down. So, when the toolkit arrived again (this time from you Lacehim!) I took out the piston, seals were fine but turning the machine over and looking into the cylinder revealed two scratches on the cylinder wall. I think what is happening is that the lube I put on the seals keeps the leak under control until the lube wears off a bit, then water starts leaking through. Like you I'm hoping Jack can organise a replacement group for me too. Sniff