I talked to Klaus and he told me he uses these tiny
magnets pressed into a aluminum 6061 T6 disk.

The hall effect sensors are tiny as well so that gives more
mounting options.

After he presses them in he uses a rivet squeezer to lock
in the magnet. It will take a bit of trial and error to get
exactly the right size drill.

He has probably sold over a 100 CD ignitions for aircraft
engines in experimental's.

Paul Lamar

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