The lever setter is a unique tool that works in conjunction with Abbey Bike Tools HAG to set brake and shifter levers at the same height from side to side. The tool temporarily replaces the headset top cap and allows you to thread a hanger alignment tool into the lever setter. Then you can use the HAG indicator to set levers the same from one side of the bar to the other. It's a great little fitting tool to eliminate variables in your bike fit. It's also great to balance the variations in bends that metal bars sometimes have from one side to the other. Once you're satisfied with your lever placement simply remove the tool and replace your headset top cap and go ride.
It's advised to use a spacer on top of the stem to help align the lever setter with the steer tube. This will reduce the impact the quality of the cut on the steer tube has on the function of the tool. The supplied threaded stud can be replaced with a longer one if needed.