[Slowlane]

Kept hearing a rattle when hitting bumps in the road. Traced it to a loose fender nut on the inside right side (upper) of the front fender. It was very loose, cant believe it dident fall off. Several turns later with a 10mm wrench got it fixed nicely. 2006 400. Slowlane

 

[Scootereno]

Probably a good time to check your windscreen fasteners to then....Mine come loose occasionally.
Glad you found it as a fender falling off can do a bit of damage and cut a tire.