you will need:
-A tool to disassemble your knife (different with every knife)
-A metal file
Step 1: Step 1 Remove the Blade From Your Knife
simply unscrew the screw that holds the blade in and hold on to the screw and handle, the blade is no longer needed.
Step 2: Step 2 Fit the Key
put the key in the knife handle in place of the blade and file it down until it fits tightly in the handle so that the portion of the key that unlocks the door is inside the handle
Step 3: Step 3 Reassemble
line up the hole on the key with the hole on the handle and screw in the screwthat once held in the blade and you are done. this process can be done to as many things as will fit in the handle.
if you have any notes or improvements please let me know.