As I look at and collect these old Webers, this is the one area where I see some weakness - the spot welds, not only on the handles but also in the lower bowls where the grate holders are attached to the bowl.
I agree with George, if Weber is unable to come through with a replacement lid because of the age, then a drill and some SS nuts and bolts will have you up and going in no time.
Good luck!!
Pat