Saw an advert in Classic Bike the other day which looked interesting. Company is called Nord-Lock, they produce a washer system which prevents loosening by vibration. They are at
www.nord-lock.com, there's a demo vid and charts and a better explanation than I could do , this product should be of interest to anyone with a bike that vibrates, like most if not all big singles and anything with Triumph on the tank. The only drawback I can see is the price, a pack of 10, 6mm washers costs £8.69 + postage, still if its going to stop bits falling off the bike it could be worth it.
Jez