So my grouphead isnt dispensing water properly like a shower anymore so I reckoned I needed to take the shower screen out for a wash, but the screw is stuck. After multiple attempts at unscrewing it I think the screw head is damaged quite badly* :P

I am thinking of using the center punch-hammer method that I found in one of the old forum threads (Gregs method I think?), but I am also worried that I might accidently slip the center punch and destroy the shower screen. So far, I cant seem to find any information on a replacement shower screen for my machine so Im wondering if anyone knows where I can get one if I do end breaking the shower screen?