Servicing the lock - to do - or not to do . . . that is the question !

[Rog]

This is very interesting - - - especially inlight of this website:
WD-40 Frequently Asked Questions
How is WD-40 different from 3-IN-ONE®?

WD-40 is the ultimate multi-purpose problem solver. WD-40 cleans/degreases, penetrates to loosen up stuck parts, prevents corrosion and is a light lubricant. 3-IN-ONE, with it's special drip spout, enables you to lubricate without any overspray or splatter. 3-IN-ONE is ideal to use on tools, rollers, hinges, in-line skates, wheels...nearly everything that moves.