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I had another local locksmith company to install a pushbutton lock on my new house, after a couple of attempts of them trying to fix and repair their install I gave up on that company and went to Lang Locks on 100st. I spoke with the friendly staff there and they set up a service call. Their service guy came out to the house identified the problem almost instantly, fixed it and guarentied that I would not have any more problems with it, which I have not. I just wanted to say thanks again Lang Locks I can lock my front door and not have to worry about getting back in any more.