long shutter release cable

[Ryuji Suzuki <rs@silvergrain.org>]

I know this has nothing to do with alt, but so is everything
else I post anyway, so why not?

I'm looking for a long (3 to 5m) mechanical shutter release
cable and bought an air release cable just to confirm it
doesn't work. It does not have enough strength to depress the
shutter buttons of my cameras. Changing camera is not an
option for this project (Indeed, all but a few of my cameras
have very heavy shutter release button). Does anyone know a
good alternative to this air release cable but with more
strength? Do I need to make one myself from bicycle brake
wire?

Thanks

Ryuji