10. Next, we'll need to grind away a bit of material to make room for the handlebar switch unit in the new pivoted position. Remount the barback to the handlebar, and use a marker to show where material must be removed. It looks like a right angle corner from this angle, but it's at an obtuse angle with regard to the barback edge. Just take extra time to mark carefully. Note that the mark is a half centimeter to the left and a half centimeter higher than where the switch unit is. This is to leave room for more pivoting (left) and to leave room when the teeth are added (higher), dropping the barback a half centimeter closer to the switches.