--snip--
I have never believed that old 'never lube a lock thing' !
--snip--

Seems to me that if you're using a spray lube and make it part of your regular maintenance, you'd mostly drive any suspended particles out of the mechanism each time. 
Wonder what our "list locksmith" Steve thinks about this...? Isn't Bange a locksmith too?

Fellas?

Cya,
Robert