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Message: <blockquote data-quote="Steve C" data-source="post: 3336868" data-attributes="member: 56622">Well, you learn something every day.  I had not thought much about increasing eye cup diameter.  Probably because that has never been a direction I personally needed to go.  I have had to decrease diameter a time or two, but never have I had to increase it.  So I'll file the suggestion away, as I am not adverse to doing a bit of modification.The eye cup assembly of the Maven (all three models) simply unscrew.  Grab the eye cup and twist, and off they come.  Occasionally one will be tighter than perhaps needed, but you will really have to force the issue to foul things up.Self sealing silicone plumbers tape works pretty well.  It does not have a sticky tape layer, but is a soft strip of silicone you wind around the object, stretching ever so slightly.  It contracts onto itself and is pretty durable.  Bicycle inner tube rings often work well too.Just goes to show that not every design can fit every face and significant use difference alterations can many times be made with practically zero chance of damage to the instrument.</blockquote>