cutting a windscreen

The first thing I did was to figure out just how much I wanted to trim off the top. For me it was 2". Then I took a string and tied it to a sharpie felt marker about an inch from the point. Then I held the string in the middle of the bar and the marker 2" down from the top, then moved the marker to the left side edge, then held my string straight while I moved across the face of the windscreen to the right side. It makes a nice arch this way. Then using the mark as a guide, I applied duct tape to cover my mark, and also another strip above and below, plus for added measure, I also did the same on the back side. Then I remarked my line with the string amd marker pen. I then rolled the bike outside and let the sun warm up the plastic for a couple of hours. I then used a metal cutting blade in my sabre saw, and proceeded to cut making sure I kept a snug fit between my sabre saw table and the plastic. I just took my time and it worked out just great. I stripped off the duct tape and then used a medium course file to dress it down, and finished off the edge treatment with 180 grit sand paper. The one suggestion that I feel was a great idea, was to use the duct tape instead of masking tape because it's stronger. Another thing I think is important and that is that the plastic should be warm. There are two things that I think would induce a crack, and one is the plastic being too cold, and also if the windscreen is a older model. I think maybe after time, that with the sun beating on the plastic, it may become somewhat brittle. Mine is a year old, so maybe that also helped in getting by without a crack.AND, maybe a little luck wouldn't hurt either <G>