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Message: <blockquote data-quote="BruceH" data-source="post: 3524135" data-attributes="member: 106398">James .... The replacement eye cups should be in the fully collapsed position before screwing them into the eye piece.  Your statement above makes me think you had them extended rather than collapsed when you replaced the originals.  I had the same experience of the eye cups not staying tight when I replaced them without first being fully collapsed.  Once I followed Lee's instructions and collapsed the eye cup first, no more problems of them coming lose. It can be difficult getting them fully collapsed using the method shown in Lee's pictures because the tubes are somewhat slick.  I was able to get a grip with the tip of my thumb to prevent slippage.  Do you have any thing of rubber such as a glove or jar opener that you can slip inside the tubes to get a better grip?  That may stop the tubes from slipping.</blockquote>