Two of you have mentioned putting thread on loose tenon joints. What do you use to make it stay there? Thread alone is simply pushed down when the joints are pushed together.

I agree about the SuperGlue. Too hard to undo, if the job's been done wrong.

Instead of smoke, I went into a dark stairwell and slipped a small, round flashlight into the joint to try to locate the leaks. We didn't see any light coming out around the pads, yet the rubber-band method still helped. Must have been extremely narrow gaps that were causing the leakage.

The low A and B are still sounding good. The G is still weak. Any suggestions?