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Message: <blockquote data-quote="mfunnell" data-source="post: 3351909" data-attributes="member: 134332">That is good on Brunton's part, but I'm still left confused.  To clarify:In Jerry's post #45, the 1st photo shows a Manfrotto 200PL plate (or similar RC2 compatible plate) on the left and a Vivitar/ProMaster plate (PL-100 or part #5924) on the right:<a href="http://www.birdforum.net/showpost.php?p=3339368&postcount=28" target="_blank">http://www.birdforum.net/showpost.php?p=3339368&postcount=28</a>Which one did Brunton supply?  The Manfrotto plate will mount on the Brunton head, but is a friction hold only and allows slippage.  The Vivitar/ProMaster plate locks via a pin in the head matching a socket on the plate bottom and will not slip on the Brunton head (and will not mount on a Manfrotto RC2 head).  The Manfrotto-compatible plate is much easier to get hold of.BTW, my personal solution was to (a) order in some #5924 plates from an eBay seller for use with Brunton heads; and (b) replace the head on one of my Brunton tripods with an Arca-Swiss compatible ball head.  I may convert completely to an Arca-Swiss system, though that is limiting if I decide I want a tilt-pan head alongside ball and monopod heads (note that my primary use is photography, not my one low-end scope).   ...Mike</blockquote>