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thanks Dennis.
It should be noted that the original steel tube now acts as a light shield - it does not have any structural function.
I also decided to use a Losmandy 8" SCT dovetail rail kit in the build to save work - I had a couple already. The two Losmandy radius blocks are carefully bolted to the primary mirror casting, after removing the primary mirror. This requires drilling 2 or 3 3/16" holes in the casting with the radius block firmly held in place by small bolts.
Two ~100x100x25 mm blocks are bolted firmly to these radius blocks - and are also secured to the rear baffle flange (which carries the truss poles). This provide the rigidity to the rear cage - if made carefully it is extremely rigid and makes for a concentric and square truss. The secret to such trusses is accurate and repeatable placement of attachment points and consistent component sizes.
guy
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