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Hi Anil,
Very nice looking collection of shiny new focusers! They certainly look robust. Any commercial outlook?
Are you maybe considering a 2" version?
How long is the draw-tube travel? Is the draw-tube longer than the focuser housing? This makes the travel capacity longer and more flexible for a range of applications.
I have one suggestion: maybe on the mounting surface of the focuser, either mill out a curved surface for better mounting to the scope, or mill out little 'legs'. These will allow for a more positive coupling to a round reflector tube. It may also help to further reduce weight, and doesn't compromise strength.
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