re: Motorized Bicycle Take a Tip...Leave a Tip
If your dustcap needs to be trimmmed when installing the sprocket, fuhgettaboutit. Get a ziplock sandwich bag and cut off a side of it(single sheet of plastic) and put a hole in it for the axle and such to fit through. Get some bearing grease and grease up the sprocket and axle area. Place the plastic from the sandwich bag over the axle and lay it flat as possible. Now, take some silicone gasket sealer and smush it around the area which the old dust cap covered. Take some more grease and smear a coat on the brake arm and bolt it down for now. Let it cure and then remove the brake arm and lift the silicone off the axle. Trim it up with some scissors to make it pretty.
Silicone sealer wont stick to grease.