Grounding steering column/shaft

Horn hasn't been working lately at all in the bugeye - never has been 
very reliable. I checked the wiring thruout, and determined that the 
steering shaft is not grounding.

To fix I want to run a ground wire from steering shaft to frame. I've 
identified a couple to places I could do this but I thought I would 
check with experts before-hand as to what works best.

Thanks for any recommendations.

Jim Rogers
San Juan Capistrano, CA