Getting Started
You must start by identifying and recording the lock’s manufacturer, see Pg 501. Next, find and record the key identification number, usually embossed someplace on the outside of the lock housing itself. Then copy your key’s identification page showing its specifications and Pg 510, Alternative Blanks. Take these copies to your locksmith so it can be determined if you or the locksmith is going to obtain the alternative key blank(s).
Take your lock, key blank(s) and your key’s specification page to your locksmith for new key(s).
If you’re concerned about using the included lever cut dimensions, you can ask the locksmith to cut your key based on the Impression Method.
If your lock does not have an embossed key number, it probably has only 1 Lever tumbler. Your only solution is to have a locksmith cut the key using the Impression Method.
If your lock is loose and can be mailed, then you could contact companies such as http://cavecreeklock.com/ in Arizona. They can cut keys using the impression method. I’ve seen notices from some of ‘The’ Guide users that they are very satisfied with their service.
Commercial, Residential, Mobile | Lacey's Lock Service (laceyslockservice.com) in Florida. I understand that they may not provide their services any longer.
CAUTION
Remember that your lock must be relatively clean inside, not broken and the levers must lay against the bolt-plate or your lock may not work, even with an original key.