>  3) Finally, are there any kits/plans available to build your own ...  or
>  does someone have one they built which works?  And perhaps related -
>  let's assume I build one, does anyone have an idea of the inductance
>  and/or DC resistance I would need to not pop the breaker and/or cause
>  glowing wire?   Let's assume US 120V 60Hz.

Just a thought and I've never tried it, but what about heating the tool, or
impact?

I know that sufficient heating, or a good stiff blow (say a 10 foot fall to a
concrete floor) can ruin a perfectly good permanent magnet.  Could the
same thing apply here?

I seem to recall the junior high science demonstration involving an iron
magnet placed on a stove burner or similar.  Not glowing hot, but pretty
darn warm.

Mike H.
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