Worked perfectly. Originally, I thought I needed to make them taller for plugs connected by strings, but they work ok with them.

Nice zero clearance insert. I had to slightly (maybe 0.5mm) file one of the screw holes to make things fit, but it worked very well.

I tried several of these zipper pull caps, and this was the best. For me, I found it worked well at 85% scale using some of the left over elastic shoe laces.