Bart replied to the topic 'M 31 - Andomeda Galaxy' in the forum. 2 months ago

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 ;)