Easy Install Thing-O-Matic Universal X & Y Axis Belt Tensioner

A slight modification to Gossamer's thing that adds sections with a narrow diameter at the bottom of the bolt head holes. This makes it less easy to install (you have to completely remove the bolts) but I think this will make it less likely to slip off the bolt heads if tension is high and helps spread the force from the bolt heads across a larger surface area preventing damage to the plywood or acrylic. In my case the bolts had already been over-tightened which lead to deformation of the plywoo