I mentioned this in my previous post, a better solution IMO is to use an aluminum sleeve in place of the wood block. Wood really has no place on a Hobie Cat, and especially not crammed inside an aluminum tube where it will soak up water, rot, and cause corrosion in the aluminum tube it is intended to reinforce.
You can go to onlinemetals.com and get a 3 foot section of 6061-T6 aluminum tube 1-5/8” OD x 1/16” wall for around $30. Cut it into four 9” long sleeves to slide inside the ends of the wing tubes. Position the sleeves so they overlap the deck when the wing is fully inserted and secure in place with a pop rivet through the wing tube. If you really want to keep the wings dry, you can also drill and tap a countersunk hole in the bottom of the cap at the bottom of the wing tube. Every so often, remove the screw to drain any water that’s accumulated.
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