Why is this 6-32 tap not a 6-32 tap?

I'm going to guess that somebody put a 8-32 tap in a 6-32 box.
 
It they worked they cant be total crap so why throw them away, its a good excuse to build a simple spark eroder for removing broken taps just in case for the future.
My eroder has saved my bacon many a time.
Do tell about using the rubbish tap for spark erosion?
Or maybe a link if you have posted before how this works. :)
 
not using the tap Graham but building an eroder to burn out broken taps.
from post 14
Read the lot as there were some gotchas.
Since then I have re wound the coil to get to the recommended values and it can run for around 15 mins before it gets too hot.
I cant believe how many times I've used it now. Very simple and cheap.
 
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