jiman There are no screws in my EFW kit for mounting the camera.
There are no M2.5 screws in the EFW box?
My (2") EFW came with a small sealed cellophane bag with six M2.5 (6mm length) crosshead flat-head stainless steel screws. The EFW has countersunk holes, so nothing sticks out towards the carousel.
(A separate bag has the smaller black M2 screws for the filter masks.)
You dealer probably has some they can drop in the mail, or just use Amazon (I use Amazon as my supply chain :-).
Chen