Despite enlargement, the triangle cord locks eventually broke again.

https://hackaday.io/project/88623/log/241925-broken-cord-locks

Went back to a new batch of round cord locks.  Helas, since the string had swollen over 6 months, it would no longer fit.  Had to widen the holes & cut some of the strings.  

Tried getting rid of the slots but the string just fell out.

It's devilish hard to install the 3 way cord locks.  The idea began hatching of making 1 hole a fixed tie off point & only 2 adjustable holes.  Easier said than done, given the limited space to tie off the string.  1 hole could be fixed by hot snotting the string.  There would be a lot more options with metal, manely an adjustable ring enclosing the outside of the triangle.  Twist the ring to adjust the tension.  It wouldn't be very compact.

Ideally, the 2nd panel could rotate after it was stacked instead of before.  There are ways to weld the 2 panels, but they're 1 way.  Lions have never separated & restacked the panels once installed.  If they end up too tight, you're normally heating them.

There  could be 3 independent buttons instead of the triangle.  They would have to be round buttons.  The risk is having them fall off.  These too could be welded.  Welded sections have been detached & reused before, a certain number of times.

Went with a round button with the intention of offsetting it & welding it.  It gripped well enough to not need any offset, so far.

Then hot snotted the 1 string in place.

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Nifty gootube channel because it's the 1st time any woman ever had anything to do with minimal shoes, though not crazy enough to fabricate any.  Her husband is the breadwinner.