I have used something similar to the superserts.
Usually, a shop would swage a PEM on, and it would be tight, but that same PEM is hard for the home shop owner to get in tight, so a hand crimped version (several) had to be made. I know the 1/4 - 20 is available but never used it. Ours was 1/4" hole, and drop in the insert already threaded onto the swaging tool. and squeeze. The tool swages the insert in place very tightly. The stuff was passing CSA back when they threw things off their dock platform to 'test' it.