it's most likely your stop pin.
the stop pin on my 710BT is short (actually short enough that you can tell it's too short) and it makes that sound when i shake it.
i don't mind though, i don't think it's too much of a defect, the blade lock up is tight so i don't mind.
hey i got my Microtech LCC today! woohoo!
stonewash serrated blade.
the edge is ground very very thin.
i find it odd, wonder how it'll be when i put it to work.
i don't like the serrations, anyone else not like them after getting the knife?
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~Fumbler
the crazied knife weilding Sarah McLachlan fan =)