13. Now remount the barback to test fit. The handlebar can now pivot to match the notch. Note that the amount it is notched in will determine the final angle of the bars- and notching both sides the same amount will make the angles match on each side. It may take a few cycles of this, checking and regrinding, to make the notch clear the way you want. There's still vertical room in the notch because the teeth aren't ground yet.