Virtical alignment of LOA block and the UOA ring.
Having a look at the alignment of struts between the lower strut block mounted on the outside of the mirror box with the lower secondary ring. Should help to determine the style of connection to use.
The software program Newt helped determine an optimum ID of the lower ring of the secondary cage to provide the least obstruction of the light path.
Looking like an L bracket mounted on the lower ring so the strut can connect to the outside of the ring. Will have to have a good think about this one.
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