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Donating a sidemount short hose would be a mess, with the typical necklaced setup. Mine is 26", but it starts under my armpit, routes behind my neck under the long hose and is necklaced. It is long enough for me to look left freely and short enough to lay neatly behind my head, but getting it to be somewhere else is not fast. Removing it to take off that tank involves taking off the long hose over it, switching the necklace to hang in front, possibly moving the left tank forward a bit and then ducking the head to get it off cleanly.Take whatever is in my mouth I will unclip and trade regs once the ooa diver has had a couple of breaths to settle down. I'm not sure where this assumption is that you can't swap the other diver to the long hose after the air share starts.
The breakaway clamps look nice. I just saw connecting the boltsnap to the breakaway clamp with line instead of fitting them together directly. I have to try that as it seems more flexible and less prone to pulling the breakaway clamp off the hose accidentally.