I purchased a thumb assist to install on my ATV or 4-wheeler generally known as a thumb saver which is supposed to reduce fatigue when the vehicle is used for extended periods of time. I installed it per instructions and it worked freely and everything appeared to be in order. Later when we went riding our 4-wheelers I went to turn around in a trail that was on a grade parallel to the vehicle which required me to stand up to retain my balance. When I did this my leg engaged the throttle because th thumb assist sticks out way beyond the... read full review »