After not being able to find anything suitable to fit in a lash tab on a PFD for an airwave type clip, I remixed Killer-Prints belt clip, making the belt clip straight and adding a hook at the bottom. This fits very tightly into a PFD lash tab and 'locks' into place. It can be removed by putting a flat screwdriver or piece of metal to release it.

Yet to be tested in the wild, but looks good so far.

Print in PETG and 100% infill.

First model so a work in progress, but functional.