I'm with Minnewaska:
Why not eliminate the spin shackles? D-shackles won't release.
There is really NO cause to use spin shackles on a furling sail that is probably lowered 1-2 times per year. I don't care for them anywhere but spinakars or jibs on race boats that frequently change head sails (multiple times per day). Otherwise, they make terrible halyard shackles. Never use them anywhere where a suprise disconect is painful. They make sense on a chute, where fast release is important to safety.
Yes, you may drop a few pins. Probably not, not once you learn how to hold them (with a little side force on the pin to hold it in place while threading the sail--haven't dropped one in years). But you'll salvage 2 expensive spin shackles in the trade.
It's probably not a surprise that rock climbers don't even own them and that you don't use them climbing the mast.
(when asked how he reached the starting holds on a difficult rock climbing problem that clearly favored taller climbers - he was perhaps 5'5")
"Well, I just climb up to them."
by Joe Brown, English rock climber
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