20ft cable release for e10?

I've been searching high 'n low lately for a source on a 20-foot shutter
cable release for my Olympus E10 dslr (electronic, not air-release).

I already have a 36" RM-CB1 that I wonder if its possible to splice in an
extension cable to lengthen it?

None of the local camera shops stock long cables, and haven't had much luck
searching online.

Anyone know of a place that carries 20-foot cables compatible with the E10,
or failing that if a piece can be spliced in to the RM-CB1.


S.K.