I have a very unusual keyhole plug lock. It appears to be similar to the Bell type lock with the wavy groove on the side of the key. The key is 8 1/2 cm in length. The groove is only on one side. ...
I recommend Super Lube synthetic grease with Teflon.
(note-I tried to post an image several times but "Upload failed due to failure writing temporary file").
Pete Schifferli
In the photo's you can see a RED stripe inside the safe interior and around the door which appear to be a sort of seal.
But when I close the door it is obvious that the door recesses a fraction...
I have a bit of "old" vaseline/graphite grease, which is what was used on old phonograph gearing - so I'm thinking that since it is basically from the same era that this might be a good choice = yes...
WD40, is NOT the correct lubricant. Yes it's ok for a degreaser & cleaning agent, but as a service product, this should not be used.
Ok, why not?
WD40, will when dried out , ie in a centrally...