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Paul,
They don't say they are actually using a Serrurier truss design - just a carbon fibre truss.
The Serrurier truss is a very complex (not really, for a structural engineer) combination of tube strengths, sections and end joint conditions. When designed properly it will definitely hold the alignment between the secondary and primary mirror.
(I was lucky enough to spend some time with Grubb Parson's during my final university year and saw their telescope design and manufacturing processes.)
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