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Good information, (below), thanks. On the issue of availability,
though, I have to wonder why they would NOT be available for sale? Obviously, certain manufacturers of the multitude of ham-stick type antennas use them. There must be a large scale source, somewhere! Ed As a modification to this, since you can stand 1/2 inch thread, how about using a 1/2 inch bolt and brazing or silver soldering some 1/2 inch ID tube over it? Not only will this be easier than trying to center the 3/8 and potentially stronger than epoxy, but it would keep that RF continuity. This is the sort of part that's expensive to turn out as a one-off part, but very easy to manufacture on an NC lathe -- even a cam-driven automatic screw machine would handle this with ease. Because of this I suspect that there aren't any on the open market; rather a manufacturer would just send drawings to their favorite screw machine place to have them made 10000 at a time. It's also the sort of part that's fun to make in limited quantity -- it looks pretty, you get to practice your threading, yet its not too critical. So you might want to take up Paul's offer, perhaps with a nice drawing. Just don't ask him to make too many. |
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