Hello- What is the correct lingo for what I need to fix a leaky shower faucet? I called ACE hardware, and they tell me I need a rebuild kit???? This is NOT a SINGLE hot/cold valve. What this is...are two separate handles, a hot and cold. When I try to find DIY videos or written instructions, all I get are single-handed shower valves that handles both hot and cold in one valve. I think I have a two or three valve shower assembly...I only have hot and a cold, where is the third valve located? (I have been told I have three) I know that the plastic handles in time, get stripped, and I will have to replace those, but when I removed the handle, and torqued down tightly the threaded end of the stem using pliers, I still get dripping out of the drain spout. I took the COLD side plastic handle, which was not internally stripped, and placed that on the hot side, closed it off the best I could, and yes, it still leaks, so I'm guessing it's the O-ring. (Fingers crossed) The three pics shown is what I've done so far...removed plastic handle, unscrewed the trim, unscrewed the nut that holds that outer threaded plastic tube that hold the trim on, and now I see a brass tube with a bigger nut behind it. I've tried to counter clock wise unscrew this big nut, but I am afraid something either will break or become loose. Any ideas? The dripping is driving me crazy! Thank you!