From manually pulling the rear glass part up (won't lift up on the closing cycle - but operates perfectly when opening the roof), I recently had this spring pop out (as circled in pic) - which then looked like it was about to pierce a whole in the roof! - NOT something you want to happen (don't want to think what a replacement top would cost and I would not be happy having it patched).
Dealer was kind of enough to fix it free of charge - it clips onto the bottom of the glass and is apparently designed to help the roof over the roll hoops.
Needless to say I am now less than keen to give the roof any 'manual help'.
And obviously the roof closed 100% fine while I was at the dealer - typical...!