here's a comparison picture:

shouldered vs non-shouldered

does anyone know where to buy the shouldered 3.5mm screws? it looks like the current kit has substituted the non-shouldered version of the screw.

the shouldered screws have a space where the threading stops and the head of the screw begins. i don't think the newer screw kits include them. i've lost most of my shouldered screws but the non shouldered screws will work, too. you just need to adjust everything carefully because a shouldered screw will stick out of the case instead of fitting flush if it's in a non-shouldered hole.