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PE is periodic error
EQ1/EQ2 multi speed has 2x and 4x speed, so essentially it's not variable... and this is not really needed for barn door.
I suggested EQ1 economy (or EQ2 economy) motor kit because it is basic (but has all you need with no fuss, apart from additional gears), and cheaper.
Bear with me for a while, I will post spreadsheet with calculations soon - so you will be able to see from it what you need to do to build your barn door mount
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