Go to https://www.mrlocksmith.com to learn more. Mr. Locksmith Key Cutting Video why Key Copies or Key Duplicates sometimes do not work. Sometimes when a locksmith tires to duplicate a key that is not the original key the key copy may not work. This is usually because the key is a copy of a copy of a copy… Similar to photocopying a copy of a copy, very soon the copy of a copy will not be legible. The Mr. Locksmith video