Rocky knows a lot about Thermoquads, and his videos are almost an embarrassment of riches because he goes into so much detail. Videos 1 - 10 or so are about the TQ's theory of operation, and videos A - H or so are how to work on the carb.
The only problem is that it can be hard to find the video that covers the desired subject. I am going to have to go through all of his videos in both the "theory" series and the "how to" series in order to find where he discusses the air bleeds.