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Stiff door lock


newhome

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One of the locks on my French doors is becoming very stiff to unlock. Had a look online and various links say squirt with WD40, never use WD40, use 3 in 1 oil, use graphite powder, remove the barrel and clean etc. So now I’m confused about what to do. Any tips please as the lock on the back door is the same type and the one I rely on to get in the house and that’s getting a little stiff now too. 

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No it’s stiff when the door is open too. The bolts that engage when I pull the handle up don’t seem particularly stiff. Scared myself at 11pm last night when I was fiddling with it and couldn’t get it unlocked after I had locked it with the door open. Note to self, don’t mess about with stuff late at night! 

 

They are uPVC. And it’s not hot today. Back to normal Scottish summer ?

 

 

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Have you tried a few squirts of 3 in 1 oil along the mechanism in the bits the bolts move up and down. Don't lock the door. Just move the handle up and down to see if it frees it up. If they don't move to the top the key is hard to turn.

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