Had problems with both the mortice and Yale locks on my front door sticking. Not knowing any better I tried using grease to fix them which only made things worse. Did a bit of research on the internet and discovered that graphite was the best thing to use. I gave the locks a thorough clean and applied some of this stuff, now they work better than when they were new. Just be careful when applying it as it can be very messy and could easily stain carpets or clothing.
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