Just dont span down from the most stiff setting to the softest setting in one jump. The spring will slam that collar down really hard and scare the crap out of ya. Ask me how I know that. Just work it down the individual settings from stiffest to softest and up from softest to stiffest. It can be pretty hard to turn sometimes. I squirted some WD40 on and around the inside of the collar to help it slide a little easier.