I tried serrated tri-glides. None that I have would fit a double thickness of the webbing through it.
Have you found and use serrated ones that will accept a double thickness of webbing? If so, a link would be appreciated?
With a regular tri-glide, even with a second one to backstop it, a single dive with my Genesis scooter being run hard would still move it enough to require readjustment.
I think sewn is better, period. CAN'T move, versus "shouldn't" or "probably won't" or "hasn't yet".
If I had a way to sew my own, I would DIY it. But, I don't. And my time is worth something. All in all, $30 is well worth it (to ME).