The college kid in our family has a old/ancient Raleigh 3 speed bike with long fenders. Those fenders are held in place with a strange bolt that is threaded on both ends and has a head near one end.
The short end is screwed into the frame, the long end accepts the fender rods, and then a bolt tightens down on them.
I removed the bolt with an 11/32" socket, but the closest fit I can find is a metric size. However that fit is either too loose (5mm 0.8) or too large (6mm 1.0). So I'm guessing some wonky British bolt, or some proprietary Raleigh bolt. Anyway, do you know of any place that might have bolts that fit this kind of bike?
I've emailed the local Raleigh bike shop and either they don't know how to work their email, or they have no answer....
Image from comments, in-lined to prevent link rot.