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Hi Johnny. First the rdf: sometimes you have to loosen the base-screws and move these a bit sideways if there is not enough sideways adjustment, and if vertical is the problem, try putting a small washer underneath to change its vertical angle.
From the photos it looks like you will need a relatively short barlow: otherwise it will protrude into the light-path. Andrews have a GSO one for $29.
All the best,
Dean
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