In my list of things for our team to order, I simply wrote down RJ's universal mount . . .

We also provide a Magic Arm Upgrade Kit to modify Universal Mounts (from Ablenet, Don Johnston, etc)
*into* Magic Arms (with the knob at the elbow, instead of the lever).  It's only $29 and gives those
old Universal Mounts a 'second life'.
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Do you have any recommendations for mounting plates (if needed) to keep such things as DynaMytes, Big Buddy Buttons, etc. on it?

For lightweight things like switches/joysticks, our Magic and Articulating Arm come with a 5" round
plastic platform, complete with some Duolock.  For anything heavier, like IntelliKeys or DynaMyte
and such, you would need our Device Tray <http://www.rjcooper.com/device-tray>.
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Do you make any of these that are smaller than the 5" in diameter?

As the directions state, simply cut with a scissors to your liking :)