The heavy anti-vibration bar-end weights that came with my Curvy have never fitted straight and I had to keep an eye on them and re-tighten from time to time.
Decided I couldn't live with them any longer.
Found a some old Thick Rubber Air-Line and chopped a couple of pieces down.Totally secure and straight now
Also re-applied some ACF50 to my Handlebar electrics/controls