G’day and Thanks Liza(byzantia); Why didn’t I think of that
bezel-opening tool! I hope you won’t mind if I put in a 1c
addition which doesn’t detract from your light-bulb idea. When
the tool is made, it should be hardened and tempered, but high
carbon steel would have to be used to do that, not car aerial!
So case-harden it. One can buy from engineer’s supply shops a
powder called Kasenit - I am sure you will have it and/or
something similar in your country. You simply heat the tool to
redness, coat it in the powder by dipping then continue to heat.
Repeat this a couple of times, then finally quench the redhot
tool in water, clean it up, resharpen the edge on a stone - and
there you are. In byegone days before Kasenit was invented,
potassium ferrocyanide was used (no, NOT cyanide!) which
despite it’s name is not much more poisonous than most other
chemicals. I remember using that before WW2 when I was Very
Junior! Case hardening can also be done by submerging the tool
in powdered charcoal and heating in a kiln for about an hour,
depending on the thickness of the metal and the depth of
hardened skin wanted. Cheers
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/ /| \ @John_Burgess2
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At sunny Nelson NZ where the flowers that bloom in the spring tra la
have nothing to do with the case (hardening.)