Thank you all for your help. I shall post more images of the camera tml.
Yes it is hand made. I have a small piece of wood (5mm thick, laser cut a hole), and a foil with a pinhole right behind the wood.
As far as i can tell, the hole in the wood piece and the foil is the same size.
There's your problem. It isn't a pinhole, it's a smallbore tunnel.
Cut a hole the size of a quarter, put the foil pinhole behind - or in front - of that.