Bottletopburly Posted May 10, 2020 Share Posted May 10, 2020 @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 . Link to comment Share on other sites More sharing options...
+Graham Posted May 10, 2020 Share Posted May 10, 2020 Hi David. The only difference will be the gear ratio. If you use less teeth your focus adjustment will not be so fine. Bottletopburly 1 Link to comment Share on other sites More sharing options...
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