Well, as far as the cable goes, there are components available via the vintage motorbike scene to make up control cables, and it isn't rocket surgery to do so.

Info: https://www.outdoorking-forum.com.au/forum/ubbthreads.php/ubb/showflat/Number/75404/

Bits: http://www.venhill.co.uk/

Cheers,
Gadge

"ODK Mods can explain it to you, but they can't understand it for you..."

"Crazy can be medicated, ignorance can be educated - but there is no cure for stupid..."