These srews go through 4 surfaces:
??? maybe a guide
shell that has to move
What I would do is to take one screw out and have a verry good look at the hole.
File that screw down a bit and measure its lengh.
Than do the other screw to the same lengh
You will have to doe this a couple of times to get to the right lengh.
Otherwise: you have an other Cook lens: take one screw out and measure,
file the screws of the problem lens down to that lengh replace and see what happens.
Good luck !