The message
from "Andrew Mawson" contains
these words:

When I bought my Spot Welder it came with such a device that fits in
an electric drill and sharpens the copper electrodes to a blunt cone -
so go and spend £400 on a spot welder and you'll get one free !

Cor, when I was a lad we had to do that with a file.

--
Skipweasel
Pay no attention to that man behind the curtain.