nut

As the title says, does anyone know what this is called (I'm guessing it's a washer of some sort) and if they know where it can be bought in the UK (online)? http://imgur.com/a/IoWE6 http://imgur.com/a/yc9B1 When changing a few rusted bolts I noticed that on the front mudguard of my 690 Duke...

Sunday was a lovely day.. A mate called to say he was about to finish work. We both ride supermoto (mines a 625SMC) so we planned to go for a ride.. I jumped at the chance and hopped straight on the bike. (Helmet, Jacket, Boots and Gloves of course;)) I filtered through the traffic.. until got...