AM8 5mm Y-Axis Belt Tensioner

When I upgraded to the AM8 frame, I also replaced the stock tension pulleys with toothed pulleys. I bought pulleys with 5mm holes (twice..arg) so I created a tensioner that will accommodate a 5 mm / #10 bolt. I also widened the arms holding the pulleys a bit more to provide more strength around the hole.

Note that there is no inner standoff, so you can't tighten the bolt holding in the pulley. I used a locking nut.

Update 3/14/2020: I upgraded the carriage plate from the stock "H" shap