New answers tagged troubleshooting
Start troubleshooting with any recent fixture, switch, or outlet work on that circuit. Then trace the problem circuit from the main box outward removing every junction faceplate and inspecting. Jiggle and twist connections while looking for issues. It may be resolved just by a few turns here and there.
If the vents are blowing the room temperature air weakly, then it sounds like there may be a duct disconnected somewhere that's blowing most of the hot air somewhere that's not useful (into a corner of the basement, into an unconditioned attic, etc). I'd trace the duct path from the furnace to a register and see if you can see where any disconnections might ...
I've seen tables where the height was set by a threaded or wedged platform pushing up against the back of the router, rather than counting on the router's own clamps to set and hold the height. You might need to consider that. (A more elegant version of the 2x4 answer.) Also, of course, make sure that the router bit isn't slipping in the collet. If it is, ...
One thing I do in removing lights switch covers etc is take a razor knife & cut around the edges then as I pull coveers away I don't ruin 6 inches of paint wallpaper
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