As it happens, the Whitworth profile DOES have a radiused root.
Still, the caution is well-founded.
One can only suggest that it is better to clean up a thread with a die
nut than force the threaded connection to engage, on a lesser of two
evils basis.

Brian W

On Sun, 12 Sep 2004 17:39:10 +0200, "Steve Lusardi"
wrote:

Please be forewarned! Using a die to chase a thead on a rigging terminal is
bad news. It sets up stress concentrations at the bottom of the V that will
lead to cracking and failure. Those threads are rolled and have radiused top
and bottom profiles just for that reason.
Steve

"A en M Sijtsma" wrote in message
.. .
I like to repair the threat of the rigging terminals. So have need for
withworth halve inch tapping and cuttingplates. But the the threat is
also left. Where can I order for that gear? Is there any website?
Thanks,
Arjen