On Thu, 15 Oct 2009 09:25:17 -0700, Jim Thompson
wrote:

Does this exist...

http://analog-innovations.com/SED/BallAndSlot.pdf

Ball and _Slot_ as opposed to the usual Ball and Socket.

Low load. Hobby size... maybe 1/4" to 1/2" ball.

...Jim Thompson

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Probably the easiest way to get it is to have a friendly local machinist
make it for you.

One pass with an end mill to allow the next pass with a ball-end mill to
be made and it's done as long as the slot will be wide enough to let
your whatever-it-is into the channel.

Another way, if you're just looking to retain the whatever-it-is might
be to use some of that channel they use for shelving:


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