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Im also from the old school asimov and use the same technique but that doesnt mean its perfect. For visual I find it good enough, though I will admit a good tool/tools will make it easier and eliminate that nagging doubt. I will eventually purchase the tools but it wont simply be a cheshire. I'd rather jump to the top of the tree in regards to collimating if I am going to purchase tools for the job. Good collimation can be achieved, with the sight tube and a good understanding of the steps involved.
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