On Thu, 20 Oct 2011 20:36:39 -0500, Karl Townsend
wrote:

Please look at this pic:
http://www.metalworking.com/dropbox/tripod.jpg

At left center is a yoke and thick disk with a bolt clamp. The yoke
and disk are grooved or racheted. I'd like to buy this component, if
possible. What do you call it? Where might you get it?

When I worked at Southcom, Int'l. in the early 1970s, we had them cast
in OD-green polycarbonate for our manpack radios.

Google "serrated positioner", or squawk at actual humans at McMaster
for more info.

--
Happiness lies in the joy of achievement and the thrill of creative effort.
-- Franklin D. Roosevelt