The ones that tighten the shiny bits. Two screws per rectangular shiny bit. The shiny bits are srewed between the enclosure and the case
I took a look at it and tightened it a bit. Is the way you mount the Scythe the same as the screenshot iin the first post? You have the screws not screwed in tightly so there's no actual contact between the enclosure and the case.
I think that might reduce vibration but I can't do that since the P180 5.25 are slide bays only. The sliding mount system makes full contact with all 4 of the metal mounting brackets on the Scythe enclosure