On Wed, 25 May 2011 19:51:22 +0100, Ret. wrote:

Don't think I've ever seen a ceramic insert in the likes of B&Q,
Homebase etc. I got mine froma builders/plumbers merchant. They
had a
box of them on the counter.

Are you referring to the entire ceramic 'cartridge' - or just the
ceramic discs themselves?

Whole kit and caboodle.

What pushes the discs together? There didn't seem any
(simple/obvious) way of taking the one I had a part to get at the
discs, otherwise I would have... May still have it my "scrap brass"
box.

--
Cheers
Dave.