I need a screw (although technically I think it's a bolt)

Hi all
Due to some sheer incompetence on my part I did some work on my daughter's bike on the grass and dropped the screw that holds the indicator lens to her gear shifter.
The screw you can see here

Anyone know what size it is or where I can get a replacement from? The LBS haven't been much help, I even tried Halfords in desperation. She can't race the bike until I can put the cover back on so I need to try to get this sorted ASAP. It's a Shimano 2300 shifter
Also in the interests of fairness, picture blatently stolen from this Ebay listing here (which is my plan B source for the screw/bolt)http://www.ebay.co.uk/itm/Shimano-ST-2300-right-hand-8-speed-shifter-brake-lever-/221516364708?pt=UK_sportsleisure_cycling_bikeparts_SR&hash=item3393677ba4
thanks
Due to some sheer incompetence on my part I did some work on my daughter's bike on the grass and dropped the screw that holds the indicator lens to her gear shifter.
The screw you can see here

Anyone know what size it is or where I can get a replacement from? The LBS haven't been much help, I even tried Halfords in desperation. She can't race the bike until I can put the cover back on so I need to try to get this sorted ASAP. It's a Shimano 2300 shifter
Also in the interests of fairness, picture blatently stolen from this Ebay listing here (which is my plan B source for the screw/bolt)http://www.ebay.co.uk/itm/Shimano-ST-2300-right-hand-8-speed-shifter-brake-lever-/221516364708?pt=UK_sportsleisure_cycling_bikeparts_SR&hash=item3393677ba4
thanks
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Or, you could hoover the garden. It'd give the neighbours a treat.
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