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SP-C6 focuser with copper wire support
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The above image shows a small strip of solid 14 gauge copper wire that has been flattened and wedged under the focus knob assembly. This prevents the focuser assembly "slipping" down that extra 1 or 1.5 millimetres (and allowing the brass gear to not fully engage the brass track, resulting in unacceptable focus slack / wobble.)
Differences may exist between model years of these SP-C6 telescopes - slight variations in the designs - not all appear to be created equal. For example, on my particular sample (1990), the focus knob assembly is held with two very undersized Philips head machine screws. The holes in the focus assembly through which they pass are much too large. It is this defect (intentional so as to allow some play in the pack and pinion + adjustment) that is the single root cause of the assembly "slipping" down or not being held securely to the cast aluminum sled assembly. (I doubt that all models of the SP-C6 and R150S suffer from this not so minor problem.)
This mechanical separation, or partial separation, is most likely the root cause of many a worn out or stripped rack and pinion on these telescopes.
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