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Timing drive pulley


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@GrahamCurrently looking to add my little stars  mk1 deepskydad  autofocuser   To my 127mm mak now I need a timing drive pulley with a 12mm bore  to replace focuser adjuster is it going to make a big difference as to how many teeth I need seen a video and they used 40 toothed wheel  other than belt size will it make a difference if I used slightly less toothed drive pulley .

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