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Message: <blockquote data-quote="ceasar" data-source="post: 3337628" data-attributes="member: 26155">Don't worry about it.  It saves weight.  It is probably there to get access to the hinge in case it needs to be tightened.  It is easier to take it off and replace it than having to chisel off a heavier metal cap to do the work.If it fits you, you will be happy with it.  I have and I still often use the venerable  "Brick;"which is the old, heavier Leica Trinovid 7x42 BN.  I also have an 8x42 Ultravid Blackline so I can comment about the changes that took place with the Ultravid when it replaced the Trinovid.The 7x42 Ultravid HD Plus you have is a much lighter weight version of that old Trinovid with modern updated optical coatings that make it brighter and add water repellent coatings.  The exterior is redesigned to be smoother and easier to handle.  The eye cups are re-designed and are softer with more intermediate stops and the diopter on the focus wheel is easier to use.   It keeps its 17mm ER and 8º FOV (420'@1000yds).   Basically it is the same binocular but lighter in weight with a more efficient, redesigned exterior and "souped up" optics. Bob</blockquote>