Here´s 2 other photo´s showing how beam is mounted.
The upside of beam will work against 2 rubber cusions mounted on main frame
Here´s the beam installed, the pivot has a steel pin. If there should be a movement on beam up and down, you need rubber gaskets inside the beam where side track frame is connected to beam. Short: the side frame can only move circular around the main pivot axle (if steel to steel, I have 2 o-rings in side track frame) and the beam is working 90 degress in opposite, that makes the beam going a fraction inwards when going up and down. To make this movment possible I have also installed a rubber tubing in beam. It works great without any bindings. Metal to metal in all connections will never work here!
The beam gets a lot of stress on real machines, it´s common that it brakes!
Hope this explains how it is done and how it works.
Dan
ps. have contact with another operator of an D6 nearby so will go and take photos and messurments on dash board next weekend.