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if you don't already have, get free femm 4.2 [finite element analysis software]
Then you can characterize currents in conductors, self inductance, etc and plot the distribution of currents through your conductors - very educational.
Heads up, a metal washer is a 'shorted turn' of a transformer so if you have thousands of amps at 100kHz, you're likely to burn up that washer, burn the bolt in two, and completely lose the structure.
If Doug S. previously of Applied Materials, is lurking, he can describe in better detail.