Ray:
The real problem when the top is stuck in the completely open / down position, with the clamshell on top of it is that it is difficult to do the Owner's Manual manual procedure
because of the tremendous pressure that the black "hydraulic" pushrods receive, because that is what holds the clamshell secure after it closes down on the canvas portion of the top...
If you have a '97 to '99 Boxster, it is more likely that something else also happened (e.g., the V-levers have over-rotated and are "pretzeled". (NY term, LOL!)
The convertible top can and does operate with only one plastic ball cup attached and intact as it acts on one side of the canvas' frame member.
I wrote up a different procedure a while ago, but will have to search for it to post a link to it, with photos. It involves unbolting the 19mm bolt that resides in the middle of the convertible top transmission, where each one secures its respective V-Lever
Regards, Maurice.