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Source for OTA tube
I've recently bought an 80mm x 400FL objective and an 1 1/4 focuser. Looking to make a short tube (F 3.75 ?) OTA for solar observing. Can anyone advise a source for 100mm ID Steel or Aluminium tubing in NSW. Would be good if it could be purchased to quoted length and ends machined square as I don't have easy access to a lathe nowadays.
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