Don, what's a white plastic pail?

Incidentally, there's a Duct Tape website. They experimented and found that whilst duct tape could be used to fix damn near everything, the one thing it didn't do well was heating ducts. :-)

My nomination for indispensible (-able?) stuff is JB-Weld. It sticks as well as Araldite but doesn't run like Araldite, and you can wash it off your hands with soap and water afterwards.

Back to WD-40, I prefer oil. Put a bit of oil on the sticky key, run it in and out of the lock a few times, and that loosens the tumblers up quite nicely.

Grab.