Hensim 110 quad clutch adjustment

[modaddyo]

I have a hensim 110 automatic 3 speed quad. The clutch is starting to slip. It needs to rev high RPMs before it slowly ingauges and moves. Once moving it seems to reach up to speed. There is a shaft and lock nut on the outside of the clutch case. after researching online I've noticed it most of those have a slot on the shaft that you can turn after loosening the lock nut around it. This particular model does not have a slot on the shaft. It seems to have a washer. Maybe even a couple or on it but one seems to have wore out. Wondering how to adjust the clutch to make it tighter with the washers spacing. Any help on this would be much appreciated.