Here's some goodie for 2016.

Here’s some goodie for 2016. V Wheel Bracket for Bed for 20x20 extrusion in X configuration… The small ribs around the screw hole and at the corner is made to break-up easily and perform better than automatic support (even w/ Simplify3D). The slotted lateral hole make for small adjustment (2.5 mm x 2 if you take into account that you are on a diagonal and the symmetrical part will allow for the same amount of adjustment).
My bed is now rock solid in X/Y and Z.
Print your’s from here:

Always great design…but How adjust position?