Hi Tom
I used a weak ferrite for double checking polarity has i went around.It is cool to hold it loosely and move it around.It literally spun around in my hand.
Your beetle should be safe here has all the flux will contained within the gap.
The blades might grind it up though.Welcome anytime though.Has you welcomed me.
I can see my test coil may be under a bit of stress.
Mark
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