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Iceman your 10'Dob would have a 2" focuser I assume so you can use a 2" Barlow and put a 2" to 11/4"adapter in it to use your 11/4'eyepieces. If you look at the Barlow page he has an adapter listed on the page.
Just watch your weight with your set up . The Ultra barlow may come with an adapter : it does not mention it though.
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