65121 flipsky to us-box paddle board (sup board) adapter

Electric motor coupler to standard us-box fin.

Used that motor: https://aliexpress.ru/item/1005002404448629.html

another link:
https://sl.aliexpress.ru/p?key=idVL3So

Instructions:

cut the fin (measure by eye where it will fit best)
drill holes for m3 bolts
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