I started out with perspex when I almost fell over when a glass co wanted $390 for a pair, but after a couple of years, you could pick they were perspex from the other side of the street and it spoiled the car..
I hunted around and got them for $150 , then sandblasted a nice little Model A logo at the bottom.
I have had four open cars that I have installed the wind wings on. With each one of them, on the pinch clamps, I had to drill and tap for US fasteners that would not strip out and would properly be long enough to hold the glass right and tight. Adhesive rubber pads give the pinch clamps that extra bite. I have had success every time, but not without a close study of where to make the adjustments of the pinch clamps. I wouldn't leave home without the wind wings, they make a big difference on the pleasure for your riding comfort.
Probably I should have said SAE fasteners rather than US fasteners. The reproduction import wind wing clamps that we get have metric fasteners that are tapped too shallow and are poorly fitted to the wind wing clamps. The wind wing clamps have to clamp parallel and tightly to the glass to work properly. Properly fitting fasteners are a must and that is why I now always replace them with proper fitting fasteners. Having SAE taps and dies handy, is why I replace the metric fasteners with SAE fasteners. Nothing much more to it than that. Using proper fitting fasteners makes a big improvement.SSsssteamer,
I like your idea and would appreciate it if you could post a pictures of the US fasteners and how you installed them.
A lot of great ideas here. Thanks to all of you.
David Serrano
Wind wing bracket photo taken from the right inside. You can see my new fasteners. They make a world of difference.