I have not done this yet, but as i understand it, for the hardware side it’s not really that hard.
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solder 1 wire to aux 4 signal
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solder 1 wire to any GND connector (preferably the one next to AUX4 for tidyness)
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connect one of those wires to a plate you can put under the sled,
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connect the other wire to an aligator clip (i was thinking to use a magnet, would that work too?)
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Put the plate under the sled so that it covers the opening and put the clip on any metal piece of the router (the router bit) .
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Run the gcode blurfl posted.
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The Z-axis will lower till it senses some conductivity and know what the zero point of the Z-axis is.
From that point on i’m not much help, my maslow should be arriving tomorrow, so i haven’t gotten much experience yet
And with a totally awsome schematic
you could also solder pins in place and use connectors, but this is the minimum required i believe.