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I have the following door handle / lock combination that leads out to my garage. The key for the door has long been lost and sometimes someone will turn the internal lock and the door cannot be opened from the garage side. I wish to disable this lock, how do I do that?

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Could you just replace the knob with a non-locking version of the same shape and style? –  Tester101 Jul 4 '12 at 16:17
    
I could be that would require a lot more effort and cost and is currently plan B. If I could disable this lock that would be the best solution. +1 for suggestion though as it is certainly valid. –  Guy Jul 4 '12 at 16:35
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I'd remove and disassemble the lock and try to figure out how to disconnect something inside it so that locking capability is disabled. –  sharptooth Jul 5 '12 at 7:52
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I thought this was a home improvement site? I'd get a new lock with a new set of keys. You're going to need to spend the money one day when you sell the home, why not enjoy the benefit of it while you live there. –  BMitch Jul 5 '12 at 12:49
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I don't get why so many people focus on installing a new thing. The OP is ready to toy with his current lock and spend time on that and he asks a specific question on what can be done. I'm pretty sure he knows he can buy a new one and I'm pretty sure it was his sane decision to first try adjust the lock. Why so much focus on "spend this sum of money and forget about your idea"? –  sharptooth Jul 6 '12 at 9:31
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4 Answers

First, unlock the door. Now place a piece of tape across the small knob you use to lock/unlock the door so that it doesn't move. Next, take off the handle and glue the knob in place so that it cannot be operated. Re-install the handle.

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What if I just put some superglue into the gap around that small knob when it's in the unlocked position without disassembling the lock? –  Guy Jul 4 '12 at 18:05
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I'm sure that would work too, I just figured you'd get better looking results if you did it from inside the lock instead of outside –  Steven Jul 4 '12 at 18:16
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Does this door allow access to your home from the garage?If it does, not only do you want it the lock to work but you want to use it. Automatic door openers are not the most secure system. A thief can access your garage and walk in to your house via the inside door. –  mikes Jul 4 '12 at 22:45
    
@mikes - both the automatic garage door and the internal door are alarmed. I figured that if someone were to open the garage door then that alarm would trigger and putting another obstacle in their way (i.e. another door lock) wasn't going to help much after that. –  Guy Jul 4 '12 at 23:08
    
@Guy Bear in mind an alarm does not actually stop a thief or vandal, it might only scare them (or not). And if the alarm is not monitored, it provides no protection when you are away. Just some thoughts. –  The Other Steven Jul 5 '12 at 16:08
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Another option is to take the lock to a locksmith and have it re-keyed to a new key (and get a bunch of copies of that key). I have heard that this can cost less than the cost of a new doorknob.

However, as this would involve removing the knob and taking it the locksmith, I would probably just get a new knob and replace it (unless you really like the style/color/etc of the current one).

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Pretty sure this costs more than a cheap new knob almost anywhere. Also not answering his question. –  DMoore Jun 7 '13 at 6:28
    
@DMoore I guess it depends on how close friends you are with the locksmith? It depends on how nice a knob you want too. OP said he lost the keys so I wanted to offer an alternative. –  The Other Steven Jun 7 '13 at 16:35
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I'm very late here, but if you have a Menards close they'll rekey just about any lock for around $4. (Doesn't answer OP's question, but may help others) –  Matt Busche Jan 12 at 22:57
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Glue could fail and/or look ugly. Other options cost money. When you remove the inside knob, you will see a connecting rod protruding from the latch mechanism that engages the lock button. Cut this off so it no longer engages the lock button. Do not cut the semi circular shaft that engages the main lever! Ensure the remaining stub is turned to the unlock position and reassemble the knob. The lock button will now turn freely, but it's impossible to lock the knob without a key or disassembling the knob.

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I have a residential Family Care Home and the state requires that a business such as this have doors throughout the home that will not lock regardless of whether it has a locking mechanism. I could have gone out and purchased the ones that won't lock,but they cost almost $40 a piece (I needed 6), so I placed a magnetic metal strip over the door jamb to prevent the door from locking, and the door still closes perfectly. Ace, Home Depot, and Lowe's stock these strips, and most hardware stores will cut them to your specifications for less than $2 a piece. This way if you decide to sell the home, you simply remove the strips.

Doing this saved me a lot of money, and it works!

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