Sounds like its time for a call to Harmon Specialty. Ask for Al or Andrew they'll be able to hook you up.
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I was in the same boat as you and took the player to a local ACE hardware and fitted some screws which turned out ok....Best thing to do is the bring the unit with the cover off to a hardware store and try various ones. You will be able to see which ones lock/hold the transport in place.
one thing for sure, Do not ship without locking the transport.