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Channel was used as a front member and a 10cm length of 7.9mm (5/16th) ‘I’ Beam was used as a rear member giving the width to the trailer, this would also be seen on the completed model. The resulting chassis frame was now quite rigid and thoughts turned to the suspension unit. The fine white metal set from M&G would be perfect here for those that feel scratchbuilding this unit is beyond their skills but having built up one or two in the past I thought I would try to scratch as much of the model as I could and started with the leaf springs built up into seven leaves each from 3mm wide strip with a slight bow to each one similar to the real springs.
I cut out and shaped the various brackets and built up the nearside and offside separately then glued them to the chassis making sure they were aligned with each other. Holes were drilled through the brackets at the required places and tube pushed through from one side to the other leaving 1mm sticking out each side, the air reservoir would locate in the centre on its own member.
Two 6.3mm (1/4inch) square tube axles were glued into position onto the springs, the front axle having a spacer added under each spring to give the correct angle of slope once the trailer was coupled to the tractor.

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