The windshield would almost have to be Lexan (polycarbonate) instead of Plexiglass (acrylic).
Polycarbonate drills and machines easily, it can even be run through a brake press! What it does not like is being squeezed down tight with a bolt, especially a flat head bolt. That will over time cause it to crack.
Acrylic though, very difficult to drill or cut. It will crack very easily.
It's advantage is it is more scratch resistant and shows less optical distortion. That said, the windshield could be a blend of the 2 materials. Here's what I found:
"Motorcycle windshields are made from either acrylic or polycarbonate, and each material offers its own advantages. Impact modified acrylic has a glasslike clarity, while polycarbonate windshields that have been hard coated have high impact and abrasion resistance."
So, what to do? As said, raising it will put more leverage on the existing material, plus having the old holes that close to the stress line might put it over the edge. I think I would either raise the mount or buy a new windshield.
What would the consequences of sudden failure at high speed be?
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