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Thanks Brent. Just clinging to the open channel idea for a moment longer - because this is a Dall-Kirkham, the front end is relatively uncomplicated - no focuser in particular, so all the weight is in the front ring, spider and secondary, plus the struts themselves of course. I was hoping also to simplify the connectors this way by bolting the overlapping pairs straight through to the ring; so a bit more weight gain there too. Do you still thing flexure will be a problem? With the side and bottom struts (pairs of struts actually), all resisting compression, I was hoping this would be rigid enough.
Peter
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