You mentioned the 19mm bolt at the center of the boomerang - can you get at it?
If so, you should be able to pop off the clamshell links. The links that drive the top are bolted to the boomerang-shaped lever, but the ones on that back that drive the clamshell are ball sockets. If you can pop those off, you can open the clamshell.
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2002 Boxster S, Arctic Silver, 18" Turbo Wheels, 6-speed
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