X-Axis Rod Support for Wanhao Duplicator 4

A failing of the Duplicator4 is the long 5mm x-axis rods at the front and rear of the printer - they are too thin. There is constant inward tension on these from the belts and any bend in the rod is amplified resulting in jerky movement of the head assembly when you slide it by hand.
My device just about eliminates flexing of the rod by adding a support at the mid-point. It is designed for perspex cased Wanhao Duplicator4 but may well be applicable to similar build models. Distance from the