Roger Holmes wrote:
After many experiments they found they could not beat
the human hand
applying a magnetisable compound like a potter making a pot. Sounds very
low tech but apparently it works, and I have drums which have not been
touched since manufacture and they still work 46 years on. Of course for
you, low tech could be a bonus as it means low cost. Maybe your local
educational establishment has a skilled potter who could do a great job
for a reasonable price, or just for interest.
My mother is a potter, although she hasn't done it professionally since
before I was born. She was fascinated when I told her of this. I don't
thisnk she could manage this for you, though :-(
Philip.