Aidan borrowed 7ish silver plated 12-point head, 5/16-24 x 1.25" screws. Part SBX-24-125 from Duniway. We have 25 left. We need 16 for interfacing with the gate valve and 8 more for interfacing with the ion pump. We'll need another 8 for the turbo pump which should arrive in a few weeks, so we should get some more.