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Take note that when you use 6 instead of 8 truss tubes the protrusion of the truss rods into the light path is possible. The Meade Lightbridge, for example, has an oversized primary mirror box with a smaller secondary cage. This enables you to "toe in" the truss rods without impinging on the light path.
Re the focusers, I am looking at five at the moment where the orientation of the eyepiece retaining bolt is totally random ... go figure.
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