New Throttle Tube

I am looking for a quick turn throttle tube for the R. I have a fused wrist that does not turn so well. Many breaks and last summer breaking the big wrist bone clean off and 2 surgeries with plates, bone grafts, and 7 screws have caused this condition. I raced moto-cross for 30 some years, all the sponsors said things like man you are really fast but, you should try to keep the bike up-right more often. So anyway after all these years it is now very difficult to twist the throttle without moving my whole arm. I remember what we used to call 1/4 turn throttles. This would keep me from having to move my arm so far to reach WOT. Do they still make them or something like them? and for our bikes? Sorry for the ramblings, must be cabin fever already and it has only been 4 days. Thanks wilburj

I'm using a quick-turn throttle tube made by a company called G2 Ergonomics.
It's the same one made for a 2003 YZ-450F, and it fits just fine.
It reduces the amount of twist required to get full throttle by a decent amount. :)

http://g2ergo.com/shop/catalog/G2-Quick-Turn-Thottle-Tubes-for-Yamaha-52.html