[Shop-talk] Shop door combo lock not opening in freezing cold

[Bob Kegel]

>  I've tried lubricating it to no avail (I don't know if that might
> have made it worst.)

Back in the days when I was (barely) earning a living as a photographer, the 
SOP for cold-proofing mechanical cameras was to strip them of all 
lubricants.  If it were my lock misbehaving, I'd clean it out and re-lube 
with something silicone-based.

Bob K