steamer wrote:

--Aha! Looks like RCM is da place after all. Well I'm trying to make
a die to make these: http://www.nmpproducts.com/nmp02.htm
--I dreamed this up more than a decade ago and I've given up on
trying to get a die made that costs less than any potential worldwide sales
of the widget in question. Sooo I've managed to carve out the fin part of
the cavity with a Bridgeport and my little Sherline rotary table (total
depth of fins not right due to short endmill; longer ones back ordered). But
making the 3 inserts (and the plate that will hold them accurately) is
getting a bit tricky. Will try to post some photos to my blog in a day or
two.
--I'm thinking of pouring in an epoxy of some kind as I really don't
want to injection mold them until I get the geometry of the die just right.
Gotta figure out what's available that has the correct durometer; something
like nylon would be ideal.
--I've got one of those 1/3 oz injection molding machines that
a now-gone supplier of same for trade schools sold many moons ago but it
needs to be thoroughly gone thru as it's been sitting idle under the
workbench forever; that's another can of worms I'll need to open eventually..

You are aware of the widely available and very inexpensive quick stop
clamp nuts:

http://www.use-enco.com/CGI/INSRIT?P...&PMPXNO=945606
(Currently a whopping $4.25)

Or the slightly fancier and more difficult to install version:

http://www.use-enco.com/CGI/INSRIT?P...&PARTPG=INSRHI