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When I build my dobby, not being an optics expert, I am going to have a sliding wooden panel for the focuser and secondary (with routed hole grooves under them) so the actual best focus for the primary and end use of the focuser is achieved. Can also use a primary with a slightly different focal length (should a perfect mirror ever become available in the FL range). Sliding panels saves drilling holes in wrong place for us rank beginners. (and have seen several of them with focuser holes drilled in wrong place.) Even rank learners can make a useful dobby. Screw panels into place when the optic path suits.
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