[Gardtec 300 help]

Hi,

 

Newbie, but competent DIYer here.  I've just added a couple of extra zones to my Gardtec 300, and managed to program them, not the most user friendly input method though.

I've managed to lose the bolt/screw that holds the lid/door closed.  I've got it taped closed for now, but it's sure to give out at 3 in the morning.  Does anyone know the size or type of this bolt?

 

Thanks in advance!