Bob's picture of random install 3.
Think perhaps from Flight Crafters? Much higher up than his install.
Y9-07-02
Here is Garry Stouts description of installing Ultimate ventilator 1" away from edge of windows on his 914 Tri:
"The hole I drilled to fit the ventilators was in the Plexiglas windscreen. I think in the UK they call it "Perspex" or some such thing. I used a cheap and simple tool called a "fly cutter", chucked into my cordless drill. Make sure you have a steady hand, and turn the drill at the lowest speed possible..........like 50 RPM if possible. It made a neat, clean hole and I bonded the ventilator in with Redux. The whole job couldn't have taken more than 5 minutes. I drilled the holes in the outermost corners of the windscreen, leaving about one inch clearance from the edges of the windscreen. I hope this description helps."
Y9-12-18