Just learned the term "cheese head" with regard to machine screws.
From Googling I think I need a couple of stainless steel M3 cheese head machine screws 8mm long with matching lock nuts.
Searching for them, and reading the detailed measurement charts, has been an eye opener. Loads of obscure but helpful detail, including the depth of the slot and of the head.
However the sites I've found so far seem to deal in boxes of 1,000 (or 500 if I am lucky) which seems a waste as I only need 2.
Is there any supplier of machine screws which will sell them in small quantities?
Google, as usual.....
Cheers
Dave R