take a spare one out and go to a specialist nut and bolt shop - I had to do this for a screw on my G11. Guy at the shop looked at it, guessed its size, went out the back, got a new one and I left the shop 50 cents lighter!!
I now buy all my nuts and bolts from this shop... Ever wonder why at Bunnings the nuts and bolts kits are always seem to have one less than you need? Makes you buy an extra pack at an inflated price.
cheers
Gary
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