The metal mudguard for the back wheel originally had only one hanger to hold it down. At first I kept the mudguard more or less in place by forcing a rolled up inner tube between it and the spraydeck.

Such is my capacity for ignoring important repairs that fixing this sort of thing normally takes months, but having a bike that noisily pooped an inner tube onto the road every fifteen kilometres gave powerful motivation to fit the second support within a week.