[Jeff]

Whist running a die over the thread will allow a 'normal' 259 the be
screwed
onto the socket it does reduce some of the thread to almost nothing, so I
would not recommend that method where there is any mechanical strength
required such as an antenna base.

73
Jeff

In over 20+ years of use I have never experienced anything like that.
If you think about it, the difference between the metric and american
threads - in the case is - is slight (Look just how far you can screw
a PL-59 on the meteric socket) and a very small amout of material is
removed.

What you will see if you actually try this method is that the threads will
be reduced in thickness over about half the length. The reduction getting
worse as you progress. The threads will have reduced to such an extent
towards the end as to render then no more than bumps. Have a look at one you
have done this to under a magnifying glass and you will see.

73
Jeff