Hi all.
I'm currently trying the same idea, using a pair of 1.3mm bicycle cable inners.
Tandem cables are 10ft long and will do just fine on my current layout.
I was hoping that by angling the capstan, I could stop the cable walking sideways (and therefore use several turns to improve friction), but so far that doesn't seem to work

Is this angle just very critical, or is my theory wrong ?
John