My shiny Yamaha SRX250 is missing the fastening nut that holds the front wheel onto the fork, and I have no idea what to buy to replace it. So I have some questions... *How can I measure it so I know what nut to get? I know it's partner fits in a 17mm socket, that's all. *Is this going to be a nut with a hole the whole way through, or one of those cap kind of ones? *If I ride the bike in this condition will the front wheel fall off? If there is any way of solving this problem without having to take the front wheel off and pull out the bolt that goes through the hub I'd really like to know about it.