Hey man, I dont think you should need a rebuild kit for the 2 speed the only time you need that is if the pin in the bell part of the clutch actually breaks off or gets really messed up and if the one way bearing goes you wont have 1st gear at all it will just spin on the shaft. If the one way bearing locks on the shaft you will shredd a spur gear. (never heard of this happening before) Try backing out the adjustment screw a fair bit and watch really closely when you take them apart that there is no "mushrooming" on the tip of the "actuator" (dont know what to call that thing lol) if the tip of the actuator is mushroomed out a bit just take a fine file and clean up the edges a bit.