I already have two main keys and would like a third. Where can I get a blank that is guaranteed to work? Don't want to waste money on the wrong item. Have a locksmith who does all the Mitsubishi key cutting for the local dealer.

Also, where can I get valet blanks that work? I got a couple from eBay, and they don't work! They were cut by the locksmith mentioned above, who just one minute previous had cut a normal dealer supplied OEM key blank for me. The eBay ones would only turn to the left, not to the right.

Thanks!