Electric winch conversion DIY

I'm interested, and specifically curious about the winch adaptor bit. Could you provide more info, please?
 
I got over the surgery quickly enough and was sailing solo by July. Just using sensible techniques and ordinary winches handles and loads of silicone on everything that could lead to friction.

Would still like to see a diy design for conversion.
Custom extended winch handles perhaps 14 I inches instead of 10 inches.....almost 2x power
 
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