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If I understood correctly, Aluminum seems to take about twice as much heat input to raise the temperature of aluminum as it does steel. Aluminum transfers the best much better, making concentrated heat, like from a rope friction point, spread much...

Does the ring do something a big shackle wouldn't? A bit of weld on the pin? I remember seeing and old rigging shackle that Riggs had, IIRC, that had weld built up all over the pin for bend radius/ wear surface, I think. It was in an early article about rigging rings.

Sam/ Grendel, In case it was not clear...the several lines was meant to read as two different thoughts. Different strokes for different folks about using the Belay Spool. The authors shouldn't review tools that they don't know how to use.

I mangled a section of true-blue getting a tree down quickly. Easy saved the rope expense. Buy a new one, or don't natural crotch 350-500 pound logs. I knew what I was doing, and the consequences. AFB's are not build to be levered against the trunk for negative blocking, not are carabineers...

The article looks highly skewed. So when I used a ball peen hammer for framing a house with nails, it worked much better, albeit with its own limitations compared to framing a house with nails using a screw gun, which catastrophically failed half way through banging in the second 16p nail.

My BMS Belay Spool rolls in the truck, for sure. I don't understand how someone reviews tools that they don't know how to use.