I'm trying to rebuild the stock carb. and need some help. 1st. trying to locate the proper hole for the ball pump check valves. The carb. diagram is not specific enough to show this. Saw this once on utube but cannot find it. Also how do you remove the diaphram vent valve? Have tried to pry out the diaphragm but the valve is stuck tight. Does abyone know of a way to manufacture the valve since you can't find one to buy