I agree with soldering the end of the cable. I solder the cable before I cut it off to fit. Just measure where it will be cut, solder it for about 1/2' in front of the cut. This way the cable won't unravel after you cut it and won't squish down in the collet. This gives the collet a better bite.
I don't think it has to be silver solder. At least I don't use silver solder.
Al Hobbs