}
-*translate([-40, 0, 4 - bushing_xy[0]]) x_tensioner();
+translate([-40, 0, 4 - bushing_xy[0]]) x_tensioner();
translate([0, -80, 0]) mirror([1, 0, 0]) x_end_idler(thru=true);
translate([-50, 0, 0]) mirror([1, 0, 0]) translate([-50, 0, 0])
x_end_motor();