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Hi Hans, PDF are meant to be very accurate - plus one of the advantages I see is that their weight is evenly distributed. Most add-on motors, even the super $$$ Feather-touch HSMs have most of their weight sticking out one side which can make balancing more challenging depending on the peculiarities of your mount. I prefer the Rigel in-line design.
Colin had a PDF for sale in classifieds a while back...not sure if it sold?
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