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Hi Paul.
You are very knowledgeable about the RC 12" Serrurier Truss Telescope thank you for all your efforts and input and tests on describing all aspects of this instrument. I have recently installed the Kendrick dew heater into the secondary mirror and I forgot to measure the spacing from the spider vanes to the back of the secondary housing, could you please tell me the exact spacing.
Thank you
Geoff
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