Kitteh wants to sleep in on a Sunday!
Good morning.
The duct tape seems to have done the trick. When I came out of the bathroom after my shower, there was no cold draft. The place was noticeably warmer, all the way around. Yesterday, when I was trying to add the duct tape, I was really worried that I would lose my balance and fall against the wall, or off the step-stool, but I tried to take it slowly. It worked.
What a pleasant change.