Hi Gold33
I'm doing this right now, and have followed Muskrat's advice, to cut off some of the cable outer but I use hand tools rather than power tools.
But first, because it's an old cable without PTFE liner, I oiled the cable. Then, marked the amount I wanted off the cable outer at the gearbox end of the cable. My thinking being that if it looks untidy at least I won't see it. I had to cut off about an inch of the spiral steel outer to give enough adjustment space on the cable.
I scraped off the plastic cover with a blade and set about hack-sawing into the spiral, perpendicular to the cable. Slowly and carefully, I managed to score enough of a way through the spiral with the saw without breaking through to the cable within.
Then I took wire cutters, and as if I were crimping the steel coil I wanted to remove at the site of the hack saw score, I crushed the spiral so the spiral broke. The result was a near enough clean cut through the steel spiral and crucially the inner wire untouched.
I did the same at the ferrule end too as I wanted the ferrule intact as the end of my cable outer. With both ends cut through I then stripped the spiral off the cable.
Using the side cutters I pinched the end of the spiral that I wanted to remove and deformed it so that I had a tab to hold with pliers, as the spiral unwound slightly at that point of deformation. Did the same at the other end of the spiral and proceeded to unwind the spiral by holding the tab and gripping the spiral. It's satisfying (sad
) as it comes off cleanly.
If your tab becomes too long just cut it off with your wire cutters and proceed until it's unwound and you can remove it.
Sorry if I'm 'teaching granny' here, but I don't have an angle grinder and find power tools in my hands and delicate processes end up in disaster.
Also this process might explain it for newcomers to cable-outer shortening.
Adjustment then is cinch, I start by taking up cable slack using the cable's adjusters, then screwing the clutch arm adjuster screw until there's a slight give/disconnect with the arm at rest.
There's a nice post I saw somewhere here with two images showing where the external clutch arm should be for optimal leverage.