I found the push screws a bit of a fiddle, got stuck up with grit and mud and broke easily, so replaced them with simple push in/pull out plastic trim plugs (no button to worry about pushing in too far and losing in the swingarm). They are cheap and come in bags of 25 or 50, so you'll always have spare.

http://www.ebay.co.uk/itm/25x-Plasti...item3f08c6c139

You can get them from Halfords too, but they're the same price for about 6!

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