How I fixed my wobbly clutch lever...please note this is for vertical play and not actual clutch cable adjustment.
1. Remove the 10mm nut and washer from the top of the clutch lever and take off the hand guard if you have one.
2. Using a 10mm socket on the top of the pivot bolt and a 10mm ring spanner on the bottom nut, remove the bottom nut, washer and spacer, being careful not to drop any parts!
3. Remove the pivot bolt upwards, inspect and clean all parts and lever. You should see space between the lever and the bracket which is causing the vertical slop.
4. Using an appropriate M8 shim washer (mine took a 0.5mm) insert at top of lever and move lever back into place to check the tightness of fit. The shim has to take up enough slack to reduce unwanted movement, but crucially, not too thick in order to allow the lever to return to its original position.
5. Once you have determined the correct thickness of shim, lubricate all parts and refit, always checking the lever has free play back to its original position. Enjoy your non-wobbly clutch lever 😀