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Message: <blockquote data-quote="James Bean" data-source="post: 1757427" data-attributes="member: 64331"><p>I can confirm those black rubber 'O' rings work well to maintain twist-up eyecups in the best eye-relief position to suit you. Normally I have eyecups all the way down for a 'big view' (I don't wear spectacles) but two of my binoculars (Zeiss Conquest and Nikon HG) work better for me if the eyecups are just a little up (2 or 3mm): 'O' rings do the trick. They come in various thicknesses and diameters, but don't stretch much, so measure your eyecup tubes carefully to obtain a snug fit. I bought mine for £1.27 from B&Q; not bad for a 'quick fix' and they look good too!</p></blockquote><p></p>