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Dob's are pretty simple. If it's in good cosmetic condition, hasn't been mistreated, no dings or scratches, just check the focuser and mirrors.
The focuser should be clean and smooth - not gritty.
The mirrors (especially the primary) really should be faultless, show no signs of dirt or having been cleaned, or having anything dropped on the primary.
A few flecks of dust is no problem at all.
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