Booster Chamber

[Adam Harmon <cyberman@mail.bright.net>]

        I have my brake booster chamber (also called Servo Unit) removed,
and was stumped at how to disassemble it without causing damage to it.  Does
anyone have any tips on how to open it without causing damage?  Another fear
is it appears there is a rubber gasket liner inside that i dont see i can
purchase in the parts cataloges if i end up damaging the gasket. Thanks to
all for you past help in questions Ive had!! -Adam