Yes! For my through hull DIY I used a plastic cutting board above and below, to make plates that will spread the force. This has worked fine on my kite foilboard for a year or more now. But in trying this with a SUP foil, there's a lot more forces involved. On a head high wave it broke the plastic and pulled the bolt, small washer, and a chunk of plastic right through the board. So ... next iteration, will use large washers 2" or more, or better yet, an aluminum plate on top.
mopman you live around jbay? Also have a Rebel I was thinking of converting into a foil board.
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