We recently moved into a new home (built in 1985) and have a leak from the spout in our tub/shower. I *think* we have a Delta 600 series fixture in there, but I'm not 100% positive (see pic #1 below). From extensive online research, I'm thinking the spout leak can be cured by either replacing the cartridge or possibly just the seals. The two big problems I'm having are 1) not being able to remove the cartridge and 2) figuring out what model I have so I can take the cartridge to the store (or website) to buy the correct parts. When I called Delta the CSR couldn't really help me at all given the age of the faucet and that we're not original owners.
I think I need to take off that brass "collar" before the cartridge comes off (in pic #2), but it just turns in place - not really unscrewing. Do I need to put a pipe wrench or channel locks on the collar or at that ribbed piece? Or somewhere else? I replaced a cartridge at our previous house and that was a piece of cake (I think it was a 1700 series from 1997). I'm frustrated I can't figure this guy out!
Any advice on what model we have and how to take it apart would be EXTREMELY helpful. I have a whole bunch of projects at the house and this leaking spout is the one that's killing me!
Sorry for the long post, but I wanted to try and give as much detail as possible. Thank you.
[sorry for the big 2nd picture. I wanted to try to include some detail]