Wow. That's disappointing.
Well maybe not wow.
Sometimes there's more than one way to get a good result, but there's always alot more ways to get mediocre results.
When it comes to a vinyl top, there is only one way to get it right. Doing it any other way results in crappy results.
I learned how to do it from 30 year installations professionals at the Chrysler plant in Newark Delaware. They knew how to do it and were trained in the concepts as well as the specific details for the top they were installing.
I did thousands across all makes and models. Once you understand the concepts, you can just look at any make and model top and know how to do it right.
The problem with the Modern installers on vintage cars is that they don’t know the concepts and falsely decide they know how to do it...and screw up.