Originally Posted by
Chris Chicago
I have the tool needed to install a cartridge, but I have yet to remove a fixed cup and this one may be on there pretty tight. a new adventure either way
If you have a decent bench vise, you can clamp the flats on the fixed cup in the jaws and use the frame as your lever to unthread it, left-hand threads as you probably already know.
Otherwise, if you have, or can borrow, a commercial fixed cup wrench, look in the "Homemade Tools" thread for a description of some aids to keep it from slipping.