RioCar in an Mk2 dock

For the past few days I've been using a 60GB RioCar. Not seeing the need to swap docking cages, I'm using the one that came with my Mk2. However, there now seems to be a constant rattle over any terrain. You can't usually hear it while music is playing so it's not driving me nuts yet. Is there any reason for this rattle? Would it be worth my time to switch docks? Thanks.

Cure all: Duct Tape.

Bruno

Are you certain it's the cage? Maybe it's the handle or something else?

The handle on the RioCar is much stiffer than my Empeg. I have to assume it's not that. I will shake the unit later (not too hard ) to see if the rattle is in the unit itself. I doubt it though.