[TR] Authentic choke cable, TR4

[Randall]

> Is there a source for a TR4-correct choke cable that reliably locks?  

I bought an aftermarket TR3 cable from Moss almost 20 years ago, and it
still works.  Had a fixed knob that didn't exactly match the original, but
after rounding the corners a bit with sandpaper, it looks at home.  And the
twist-lock works quite well.

> Or can the locking mechanism on an old cable be 'refreshed'.

Depends on what is wrong with it.  I've fixed at least one cable that I
think might be original to a Triumph, by fabricating a replacement for the
part that locks to the shaft.  It was just a "D" shaped piece of flat brass
and the original one was worn out.  The shaft was also worn, so I made the
new piece a bit oversize to compensate.

Randall