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Hi David,
Yes buying a cheap dob is an option for getting the parts. I would check ebay too. I just bought a mirror set there for my son so you might pick up something there.
You could get away without a 2 inch focuser- lots of people do. Personally I would always have one. My favourite eyepieces are 2 inch barrelled ones - because they do accommodate wider fields. That said a set of hyperions would work well on an 8 inch and they fit both barrel sizes.
Rod.
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