I have the following valve in my shower.
I thought it was a Grohe, but after contacting their support - it seems it is not.
There is something wrong with the valve, not letting us decrease the temperature.
I need to disassemble the unit to find the problem. However, I can't figure out how to get the thing apart. Many units have a small allen key on the underside, this one does not. It was purchased in 2002, in Canada.
I have already tried removing the wall plate, but it was blocked by the knob for complete removal, and clearly the knob needs to come off in some way.
If someone can identify the unit, that would help me find the manual. Alternatively general advice on disassembling these types of things.
Edit after 10yrs.. Kudos to Wes M. who provide instructions on how to actually open it up. The 'cap' at the end rotates left with a bit of force and unscrews. The raised ring also rotates left to unscrew and is like a big threaded washer.
I tagged Neil's answer as the correct one, as it is indeed aquabrass. The fine folk at https://www.ad-waters.com/contact/ appear to support this product still and I'm in touch with them.