Ah ok! 
I mean to thermally isolate the tube, in order to reduce 'seeing', but seeing that's generated within the OTA itself.
I don't know of a topic on an international forum. On the Dutch forum there are some topics about it, describing excellent results!
So I recently did mine, but hadn't had a clear night yet.
Thought you might like to know that with negligable investment, you can get much better quality images 
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