I think the difference is that the Bing Agency, makes money off of repairing and overhauling Bing carburetors.
I don't think they are going to give you all of the expertise to rebuild them on your own, and lose a lucrative part of their business.
If you were expecting a step by step how take apart, and reassemble again, then I guess you would be disappointed .
Lets face it people are a little hesitant to completly take apart their carbs ( especially the throttle shaft o-rings), because they think that it is a lot more complicated than it really is.
There is a lot of information in the manual, that you won't find anywhere else.
Weather for the central southern deserts of Arizona :
1600 MST (-7 hrs GMT)
Clear, Sunny
Temp : 91 F (33 C)
Humidity : 11 %
Dew Point : 30 F
Wind : SSE 7 mph ( 11 km/h )
Baro : 29.78 in Hg. ( 756 mm ) and falling
Window washing finally done!