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Plumbing woes
The good news is that the main cut-off valve for the house is not as hard to access or use as I had thought. I even didn't discover this under emergency circumstances. Just a toilet fill valve that wasn't flowing right and needed to be replaced, combined with a supply cut-off valve that didn't do a good job. This means that the various plumbing fix-it jobs I've been saving for a time when I can turn off the main water supply are now more conveniently available.

The bad news is that not only did the toilet fill valve need replacing, the supply cut-off valve is now leaking excessively as well. So it needs replacing. Until that's done, I either have water running on my bathroom floor, or I need to keep the main shut-off shut off.

Fortunately, I'm going to the gym tomorrow morning, so I can shower there.

After work, I have to get some supplies and tools: Pipe cutter (to remove the existing cut-off valve), two adjustable wrenches, a new cut-off valve, and a new supply hose. I just hope I get the right stuff. Based on videos I've found online, I think I know what I want. I just hope I'm right.

My biggest fear is that the existing valve isn't simply soldered on, but has an extension which means all I can see is part of the valve, and not the copper pipe I'm expecting. Looking up from below I can only see copper pipe going through the floor, which is a good sign.

Update Biggest fear realized, the solder joint was at floor level. I solved it by yet another trip to the big-box store and getting a 2-foot piece of copper pipe and a push-connect coupler. I cut the pipe off 3 inches or so from the elbow going up from the basement, put on the coupler, used the existing pipe/valve assembly as a story stick against the new copper pipe, cut it, installed the valve and supply hose onto the new pipe, dropped it through the hole in the floor, and connected it to the coupler. After the hose was secured to the toilet, turning on the water main was the moment of truth: no leaks. I'm sure that, in 25 years when the guarantee on the coupler and valve runs out, some plumber or homeowner will likely be cursing my anonymous ass, but it's done.