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What is the shortest eyepiece you are using with a binoviewer? My WO was reasonably collimated (but still not perfectly, around 10 arcmin which is bearable but not good enough in my book). But what made it impossible to use with anything shorter than about 20mm is that set screws would push the eyepiece sideways enough to cause headache (literally!).
BTW, the quickest way to check collimation is to handhold the binoviewer and point it towards the Moon or a bright distant light and look from telescope side (that is eyepiece holes towards sky), naked eye. If you see one Moon/Jupiter or light you are fine. If you see double image (I bet you will with most units) Moon serves as an excellent gauge on how much beams diverge. Moon = 30 arc min, so 1/3 of a moon displacement == sides are off by 10 arcmin. If you use a small finder to magnify you can measure misalignment in arc seconds! I aim for 3 arc minutes or less.
But again all this works only if eyepieces are kept centered (which setscrews can't do).
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