What tool do I use to get this fastener off my bike

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seb95

New Member
There's another indent the other side of the fastener like the one on the picture the bike is 40 50 years old so it uses different tools.
brought the bike recently it's an Elswick folder.
Screenshot_2015-07-14-11-50-19.png
 
Location
Loch side.
A C-spanner of the appropriate size. They are measured in radius and thickness.

GED40-1.jpg
 
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