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Also, if you are rebuilding the Hydrobooster I would love to see all the pictures your willing to post. I have (one day) got to rebuild mine. It has slowly been leaking for a long time now.
Try this link with pdf, it appears the tabs bend away from the spring.
http://www.mbmbrakeboosters.com/index.php?option=com_remository&Itemid=11&func=startdown&id=19