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Re: Door lock problem......
They make some stuff specifically for key locks that has Teflon in it. They should have some in the key section area of a Home Depot or lock smith. This stuff is good in the winter, too, keeps the locks from freezing up from condensation.
I've also used Tri-FLow, which I used to use on my motorcycle linkage cables to keep them moving.
The WD40 will eventually gum up from dirt and dust, which you really don't want to have happen.
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