I drill a set hole for the Chicago screw, I use a auto motive silicon like its for boats windows I get it at a car part store, I like which I have not done is seal it with a fiberglass I just use resin had no trouble with that. So its pretty simple I set on the helmet lever or glue in a thin plastic, find your rotating point, if it hits heat it up I use a heat gun bend slow don't snap it, works every time I like to use a spring if needed to space also works. can use a 1/4" or 1/2" Chicago's..