A couple months ago there was a discussion here about lubricating locks.
I had to get a key cut today and it was a tube key, so that meant
visiting one of the top locksmith shops in the area. I give the guy
credit because he made a working copy in one try despite having warned
me to try it ASAP because tube lock are particularly picky about perfect
key fit. I told him I had trouble with those locks at the best of
times. He suggested lubricating them with WD40, saying it was the best
lubricant for locks.


Now that I have an expensive copy of the key the old one is likely to
turn up.