Thanks, Maurice.
Just to make sure we're on the same wavelength, the maker of the steel ball cups is saying $2000 damage because of the plastic cups breaking. Ergo his justification for the steel cups.
But I hear you; I won't be installing them.
And BTW, thanks for your excellent contributions to the forum (and others) on the subject of the convertible tops. Knock on wood mine's been fine so far, but I know the day will come, and having all of this ref info available as well as you to ask questions of makes me feel a lot more warm and fuzzy.