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I have an 8" dob and find that it doesn't need collimating very often. If yours is F6 then you'll likely find the same. F6 is a lot more forgiving than F4 or even F5, and as mentioned the smaller (and lighter) mirror probably helps as well. If it ain't broke - don't fix it, I say.
Sooner or later you'll have to get your hands dirty though ;-)
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