When fitting the side bars to the main windscreen frame, you will be installing some fragile screws into a soft strip of brass. If you're not careful, you can easily strip these threads. There's also a chance the screws might be too long since the countersunk holes found in the side bars are made by hand and can be too deep, causing the mounting screw to bottom. If this happens and you overtighten the screw, you run the chance of cracking the windscreen. Be sure to install each screw and test for proper fit, shortening the screw if necessary. Keep each screw indexed to the hole you test-fit, and use a stubby screwdriver with light finger pressure as shown.