From Robert Smith@robertsmithforum2@gmail.com to alt.locksmithing on Fri Sep 23 17:53:24 2022
From Newsgroup: alt.locksmithing
I would not use WD-40 on locks though. It is petroleum based and can cause damage. Your better off with something designed for locks such as Houdini Lock Lube.
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From Robert Smith@robertsmithforum2@gmail.com to alt.locksmithing on Sun Sep 25 11:32:00 2022
From Newsgroup: alt.locksmithing
Also, if this is a Medeco Deadbolt, DO NOT USE Houdini Lock Lube neither. It is not designed for the Medeco Deadbolts. It will push back the gunk to the back and lockup the deadbolt completely. If it is a Medeco Deadbolt, use something very light such as TriFlow as mentioned above.
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From Robert Smith@robertsmithforum2@gmail.com to alt.locksmithing on Sun Sep 25 11:51:23 2022
From Newsgroup: alt.locksmithing
Another item to mention is that the product Medeco recommends for lock maintenance is called "FLUID FILM":