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Hi James, most of us use a focuser that has 2" internal drawtube diameter, so our 2" EP's drop straight in without any adaptor. We only use an adaptor to put 1.25" ep's into the focuser, a 2" to 1.25" adaptor.
Most 10" dobs come with a focuser that has a 2" barrel as standard, so no adaptor is required. Unless for some bizzare reason you wanted to plop in an old style 0.965" ep.
Do you require another 2" to 1.25" adaptor? if so just give astroshop a call.
Cheers,
Steve at Urangan.
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