[HawgRyder]

If the wire in question has one wire protected by a shielding casing...then as far as I am concerned it qualifies as a coaxial cable.
There are tons of types of coaxia wire...from the stuff you run you to your TV...to the special type for instruments.
They all serve the same basic idea....shield the wire from outside voltage pulses.
If you can find it...RG163 is a small diameter coax...used in oscilliscope leads....it is very flexible.
Go down to your local electronics store...and ask to see the different types he has...choose a flexible one...preferably with a multi-strand core wire (for flex)...and strip back the shield to get access to the core wire.
There are crimp on ends in lots of sizes (choose one that grips the centre wire AND the insulation around it) so that the end is best supported for the vibration.
I personally would solder the wire to the crimp end (carefully so that the solder does not run back up the wire and make it brittle) to get best power transfer.
If you have a friend in the electronics industry...he could zip you one up in less than 5 minutes (just tell him the length you need).
Have fun.
Bob