Keying tool for Master Lock "UP" series uncoded locks. Padlocks can be quickly keyed as follows:
1. Choose original Master padlock key to be used and remove from key ring.
2. Insert key into Master "UP" series lock.
3. Invert Padlock thru the jaws of your bench vise. Do not tighten vise.
4. Place MKP-1 keying tool over key and tap lightly with hammer until cylinder sets into lock. Remove padlock from vise and check for proper operation.