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I guess you're looking at the focuser for the SCT Ulrich, but it should be the same design as the 3.5" refractor focuser. The smaller diameter drawtubes are often easier to get working properly too.
These R&P models are the first of the WO focusers with decent enough design and enough adjustments to guarantee good operation. A lot of their previous focusers were woeful, especially the larger diameter drawtube models.
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