For those using an Openbuilds router mount attached directly to a C-beam Z axis with angle brackets. I couldn't work out how, when tramming the router mount to the bed, you could hold the router mount still while tightening the fixing screws. I thought about modifying the end plates on the Z axis of my workbee to allow screw adjustment to the height of the router mount on either side - then decide that this modification would get in the way, so thought that a removable attachment that would do the same thing would be a better idea. To test the idea I designed and 3D printed a plate to attach below the router mount - see pics labelled Tramming aid 2. The concept worked, but the plastic (PLA) was too flexible and moved too much under the weight of the router to be reliable (I rather suspected this would be the case), so the final version will need to be made in aluminium. I have designed this (Fusion 360 and Sketchup files attached) but can't test it until I have ordered some suitable aluminium - if anyone wants to try this before I get around to it please post the results here. Holes in the plate are tapping sizes for 5mm (for angle bracket) and 6mm (for screws to adjust/support router mount). Alex.