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I'm not a big fan of self-tapping screws, especially for use in aluminum spars, since the threads aren't as strongly formed as those made with a proper tap, and the material is relatively thin to start with...so each thread has much more affect on the grip of the fastener.
The Rivet Nuts look like a pretty good solution. It looks like the stainless steel ones are custom order and may have a fairly high minimum number to order. I am curious as to how much the tools and fasteners cost.
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Sailingdog
Telstar 28
New England
You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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