You guys are right. I should have gone fishing.
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I spent much of yesterday fighting a frozen 50-year-old toilet shutoff valve. After I managed to disassemble, clean, grease and reassemble it, and replace the tank fill valve, I took a break long enough to forget everything and then went back to test it, and could see the remaining problems with fresh eyes.
As a theatre set carpenter I was taught to periodically go out to the seats to view scenery I'd built as though I was seeing it for the first time, to catch anything out-of-place that I'd become accustomed to (before the director mentioned it).