Camshaft degree

Ok I have a question looking at this video. It seems to follow what you guys have already said. But I have a question. How and where do you set the piston stop? Is this just a random depth to set the stop?


[ame="http://www.youtube.com/watch?v=-VwsbEg7Z4I"]Camshaft Degreeing the Easy Way.MP4 - YouTube[/ame]