Mount the coaster to the forks. Get a bike chain,wrap it around the sprocket to a free sprocket welded to your handlebar. Alignment is critical so you need to strengthen your gooseneck so your handlebar won't loosen left or right. Weld a (you all seen this before) "safety lever" used in old school ten speeds with the curled handlebars that connect to your brakes so you can activate it from the top of the handlebar. Weld it to the free sprocket so it sits above your handlebar. To activate,push it down.