Out of interest which 2" barlow did you buy?
On my SW dob I've successfully done away with the stock 2" and 1.25" adapters in favor of the GSO 2" barlow with the barlow element removed.
The barlow tube houses a 1.25" adapter in the end of it which makes swapping from 1.25" to 2" in one step, which is less fiddly than changing adapters and eyepieces....
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