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- Take out the barlow and chuck it in the bin.
- Collimate the scope as best you can.
- Stick a long focal length eyepiece in it.
- Buy a 16'' Dob.
- Mount the 6'' short OTA on the back of the Dob and use it as a close-up finder.
PS. Mirror cleaning with metho does not sound like a good idea. Dirt on mirror is almost never a problem.
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