Re: Carry an extra whatchamacallit !!
If you loose the cable stop and just happen to be near a hobby shop, go in and ask for a 1/16" wheel collar. They're steel, not brass, have an Allen head set screw and work perfectly as a cable stop. I carry a couple in my mini-tool kit, just in case. The brand you'll most likely find is Dubro. They have a vast selection of neat bits and pieces that can be adapted to motorbike use. Wheel collars are used to hold the wheels on model airplanes.
Instead of JB Weld, I solder the cable strands at the end. The solder keeps it from fraying and if you don't get too aggresive with it and make the cable too thick it will still fit through the cable stop and makes clutch cable adjustment a little easier.
Age and Treachery Will Always Triumph
Over Youth and Skill & "Charlie Don't Ride"