-Victorinox Adventurer Swiss Army knife, or similar
-Verbatim Tuff n' Tiny USB flash drive
-angle grinder with metal cutting disc
-two part epoxy
Even though the circle part fits like a glove, you will need to remove other parts of the can opener. I ended up bolting an angle grinder down to a table with plumbers tape. There is probably a better way to do this if you have access to fancy tools. The angle grinder has a metal cutting disc that glides right through tool steel.
Make sure to keep checking the fit. You dont want to cut away too much material
When youre finished, you should still have the little finger nail hook to open the tool.