With no key inserted in the plug the top pin blocks the shear line, keeping the plug from turning. We've loaded a bottom pin, top pin and spring in the 1st chamber and where the top and bottom pins meet is the shear line of that chamber. The shear line of the cylinder is where the outer diameter of the plug meets the inner diameter of the housing. For illustrative purposes only 1 pin chamber is used. A bottom pin, top pin and spring reside in each pin chamber (s set of corresponding holes in the housing and plug).įigure 2A is a view through the cylinder, like an x-ray, showing the housing, plug and cylinder shear line. When the plug is inserted into the housing, nothing stops it from turning that's what the pins do. Figure 1 is an exploded view of a representative 5-pin cylinder 5 bottom pins, 5 top pins and 5 springs. You may need to understand what goes on inside a lock cylinder, which we'll just call the cylinder. If you didn't also give me your Master Key or tell me you wanted it to still work, how would I know? Believe me, there are a lot of cylinders with master pins out there that the end user doesn't know about. If I were rekeying your lock I would dump the pins in the plug and when checking top pins and springs in the housing, I would dump any master pins I might find. If the master key already works for front, back and guest, and now I am just changing the back door locks to match the front door locks, why would the master key not work anymore? That makes no sense to me. He said no, once he made the back door locks match the front door locks, they have to work the locks so it would work for the master key as well, and that would be additional $20. Now I asked the locksmith to make sure my master key, which works for front door, back door and the guest house, would continue to work. Once that's done, the front and back door locks would use the same key. He said fine, he can do that, it will be $30 for the pair of locks to be rekeyed. I gave him the key for the front door, and ask him to rekey the set of back door locks to the same key as the front door locks. I took off the back door locks, took it to a local locksmith. I also have a master key that opens all three set of locks. So I have a key for the main house front door locks, another key for the back door locks, and a third set of keys for the guest house.
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