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You should not need to fiddle much at all to get the images to merge, if the prisms are properly collimated. But if they are not, then it will be difficult to do. The only issue there might be is having the eyepieces centred in their holders (which I believe is what the article Mike linked talks about mostly).
The "- o +" are meant for individual focus only, although they will also rotate the eyepiece and holder.
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