So ok the reason why I first posted was I discovered on mine that one of those square folded steel bits had cracked and folded out. That allows all the forces on the seat front to be contained by only one of the two slots. If it gives way the seat can suddenly move sideways. Not good if your leaned over hard in a turn. It's a 30 seconds check to be sure yours is OK. I got mine tack welded. This I guess affects 3c and twins or any Laverda without a hinged seat.