Jeff I bleed using a vacume pump and tank. Very Very Easy!. I get bubbles from the threads in the bleader. The air is actually coming from the threads right there at the bleader and as long as you have a vacume source it's fine but you must close the bleeder while pulling vacume o you can draw air back arond the threads.
http://www.rc-tech.net/MGB/brakes/bleed1.jpg
http://www.rc-tech.net/MGB/brakes/bleed2.jpg
Gary
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