This is a (possibly temporary) fix if it's the TBW sensor and not the brake/switch pack clamps binding on the throttle grip.

I originally ran across a thread on another Harley forum where a guy disassembled the TBW to find out what was going on after doing a bar change. i was already contemplating drilling a hole in the TBW not knowing what was behind there.(nothing to lose)

Anyway, I decided a different approach, which so far is working, that didn't require pulling the TBW sensor out of the handlebar. (Again nothing to lose since I'd have to pull the TBW anyway). I lightly pulled on the sensor grip enough to get the amount of wire that was freestanding in the bars taunt. Which luckily I had 1-2" in there. I then drilled a hole big enough to fit a spray nozzle in and shot a few squirts in the hole. When drilling I went slow and to be mindful to get shavings inside. So far it's only been a day, but the throttle is very smooth. Turning the throttle backwards (to disconnect cruise control etc) is a little creaky still but it has gotten better after rotating it a few times. Hopefully it improves. Anyway heres a picture of what I did. I used the PTFE spray as seen in picture so hopefully it holds up well. YMMV.

 

What is the issue you're having that you needed to do this fix for?