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I like the idea of spring straps, but getting the proper size when there's no adjustability seems difficult. You need something between tight enough to stay on, but not so tight it kills your foot or is very difficult to get off - and I haven't found it yet. My theory is it is more difficult the shorter the strap is because the length the spring stretches is not enough to cope with both. And my straps need to be pretty short.
I've had no luck with 2 pairs so far. The first was made to order, but without the rubber heel pad the commercial ones come with (spring just covered in rubber tube.) I find them way too uncomfortable to wear with my thin booties. Then I bought a pair of the Tilos straps, which were a bit too big even in the small size. I lost a fin within a few dives (in a somewhat iffy situation, when a current sprang up) and had trouble getting back to the boat. My husband got a pair also, larger size and fit him a somewhat better though not ideal. But the metal connector does not stay on the post very well and he has had it come off a couple times when taking his fins off. I'm not sure it makes sense for him to continue using them.
imo, choosing the perfect length spring strap is tricky - they should maybe them semi-adjustable.
Have you tried using a nylon cable tie on the post to prevent the buckle from slipping off?
Pardon my lack of clarity. I was referring to a possible laceration NOT from the spring itself, but rather the piece of metal that I have seen the spring attached to.
In other words, the spring itself attaches to a buckle of some sort.....many I have seen are plastic(no issue with these) and some have been made from stainless. They resemble little mounting plates with the lopsided hourglass hole punched in them. THIS is what I fear is the laceration risk, NOT the spring itself.
David