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Hi Denis,
I have been through the process of cutting my Dob tube and moving the mirror up. Its not a simple task, but if your careful, not too hard.
I have a few threads on this site detailing the procedure. Do a search for Dob reborn.
I also looked into the possibility of using a Bintel Low-profile focuser. However I have heard these focusers suffer a lot from sag (the focuser tube drops) when using heavy EPs or cameras. Also for my scope the lowprofile focuser alone would not have been low enough.
Good Luck!
Dave.
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