Hi!
Here is what I do...
I buy wire from a fishing store (Thinnest possible, the one in picture tested at 15lbs) and chrome plated brass tubings.
Use ordinary 2mm treaded steel ends which I drill trough using a 1mm drill.
I take the wire and insert it through the brasstube and then through th 1mm hole in the treaded end.
second. I push the wire one more time through the brass tube...and then push it back for a third time through the brass tube. That is easy to do with the right size tubing and thin wire.

Then I use a cutting plier and press the brass tube carefully together at two places.
And then it's ready!
I do all my wire adjustment inside my airplanes and just secure it with a loop at the rear (rudder, elevator etc).
I use this wiresystem in all of my models from the fastet 375km/h pylonracer (elevator and siderudder)...to slow flying 1/4 scale aerobatic models and ARF scale models like the GP GEE BEE R-2 GEE racer (elevator and rudder)
see the pictures!

Regards!
Jan K
Sweden