I'm the homeowner/landlord - I've changed the 1225 cartridges before with no problem....until tonight.
It has the Chateau style handle. Needed a little CLR to loosen screw but it came out. Cartridge came out with very little effort. Then I noticed the bottom was not attached!! Top and entire stem came of cartridge - the bottom pulled away and is STUCK.
I left it for the night with a rag drenched with CLR stuffed in with the remaining cartridge.
There was a lot of calcium build up on the inside of the handle but the CARTRIDGE itself looked like every other picture of an old cartridge. HELP - this is a rental unit. I had some "little things" to fix and decide to updated smoke detectors while there ($300). I rent the house to my best friend - fortunately didn't freak out that the water is turned off overnight.
Any advice? I need to fix this asap and get the water on. A big $$ hit from a plumber will wipe me out for the month.