... in the boot the wings attach with nuts, bolts and penny washers but in the engine bay rivnuts?. In my 1998 build the rear wings had some blind rivet nuts and some nuts and bolts. And as soon as I heard about the advantage of fitting sacrificial bolts I changed them all to nylon. Does anyone do that for clamshell front wings, and, if not, what's the difference? Greater aerodynamic forces? Jonathan