short leads on Canon ACK600 - how rto extend?

I recently bought one of these (from eBay, much cheaper
than Canon's extortionate list price).

Works well, and should allow me to take some
very long/multiple exposures for stacking and
bracketing, and also some time lapse
shots (courtesy CHDK and a script)

But the leads are very short. Certainly
too short to conveniently use a tall tripod
any distance at all from the power point.

Can I get extension cables (for the low voltage lead),
or do I need to cut 'n' solder an extra piece of
flex in - both ends (transformer and plug) are
moulded on, so putting a new, long cable in
doesn't appear possible (unless someone know different).

BugBear