Make (or get made) a pin and drill the end for a split pin. The rear footrests are all like that.
G
restoring old bolts
I did some hunting on some industrial fastener websites. It turns out that they are tubular (sometimes called semi-tubular) rivets. They are used in situations where the two fastened items pivot because the shaft of the rivet does not swell as it does on a regular rivet.
http://en.wikipedia.org/wiki/Rivet#Semi-tubular_rivets
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