align the tensioner's axle
As the bike's rear suport is a V and not in line with the wheel. mounting the tensioner on it will cause the rotation of the tensioner's wheel at an angle to the wheel. I cut the mount a third in on both side and give it a twist so the axle of the tensioner's wheel is the same as the wheel. Then bring it to my local body shop and pay the guy 5$ to have it weld back strong. I have him weld the bolts on inside bracket too so now if I need to reposition the tensioner, I need only one wrench. I also weld a washer where the tensioner's axle go through so it cannot slide down. It really improve the vibration I get from the chain.