Can anybody help me figure out how to tighten the friction on a 2001 Johnson Ocean Pro? The manual shows a screw in the throttle handle that is called "throttle friction", but turning it seems to do nothing. It feels as though maybe it is stripped or isnt catching whatever it is supposed to catch on to increase the friction. Right now the throttle is so loose that it is difficult to start or change speeds without throwing somebody overboard. Also changing speeds in rough water is difficult to do because the throttle is so loose. Any help would be greatly appreciated.