I think that I may have found why my mixer leaks.
I removed the brass cartridge today, and I noted that at the rear of the cartridge (this is where an opening is controlled by the large knob that turns on the shower) the bit that shuts off the water by acting a bit like a guillotine, in the fully open position the space is fully open , but when the knob is turned fully clockwise as per shutting off , then the guillotine does not full close.
about a 1 mm opening at best remains, maybe due to bad original fitting together or bad chinese? manufacture
I tried to pull out the rear bit after removing the circlip without result.
the type of cartridge can be seen at (but not bristan)
http://www.ebay.co.uk/itm/Bristan-Thermostatic-Cartridge-cart-5-06732COMPL-/120748987655?pt=UK_Home_Garden_Bathroom_Shower_Units_PP&hash=item1c1d335507
the above has a 3rd rubber ring at the end where mine has not.
my hot water supply is not coming from a tank, but directly from hot water cylinder,
bernard
July 2011
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