Installed these on our 1998 23cc. The bottoms are fastened in with a stainless steel electrical conduit strap around some neoprene padding. We used screws with the biggest possible thread, with some 4200. Only drilled into liner. These are angled swivels, you need them here b/c contour of gunnel. There is also a backing plate under the cap.
Biggest test was a 500lber taking a down rod right under the boat ~30lbs.
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