Hi Alex,
After I typed the second part that you quoted in your last post # 80 I realized that it didn't add up so deleted it and replaced it with the first part that you have quoted. Well done for getting both !
However you have shown that the arms do indeed go over the suspension spring (sorry) so I think that the explanation is that the arms on the beach have had the pivot points cut off them where the arm bends down to the pivot - so about 30" removed. Looking at the zoom of the beach photo one can persuade oneself that one can see a cut box section.
For the benefit of others the suspension spring is a massive transverse spring the ends of which engage with the track frames just in front of the forward top roller. The track frames themselves pivot on the shaft that goes through the sprockets which also rotate around that shaft.
David
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