I don't even use the mechanism/contraption anymore. I just put a dab of the UV curing resin on the crack and a piece of the clear plastic and let it cure. Then razor blade off the excess once it's cured. And if you have a crack thats starting to spread a little, I drill a small hole about 1.5mm right at the end of the crack to stop it from spreading. You can buy little bits to do this for a dremel/rotary tool. Great way to save money on windshields!