A "shocking" efoil build - why is Flipsky 65161 motor conducting electricity into the water?

efoils – Electric Hydrofoil Surfboards
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Only a small amount of material to remove and at the time I didn’t have a drill press. I just freehanded mine with a new reamer bit and a good drill.

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I do have a bench top drill press so that would be the other option though need to be careful to stay centered on the hole. Appreciate the input.