[Jeff, Torrey, Daniel]

We cleaned installed a 6" gate valve from the Holometer onto the top of the 6 way cross pointing towards the input. I placed the handle to be more accessible from the side of the table. I tightened the bolts by hand until there was steel to steel contact. I couldn't fit the torque wrench. 

I then added a 6" to 4.5" reducer flange on top of the gate valve and tightened the bolts to 34 Nm until there was steel to steel contact all around.

We then added the Agilent TwisTorr 74 Turbo Pump onto the reducer flange. We could not fit screws when they had washers attached, so we did not use any washers. There is *very* little tolerance for getting a wrench around the screw heads such that we had to center the pump more precisely than usual. Even with that, we could fit only the torque adapter wrench around the screw (and barely at that). I think we should buy another (not another set) that I'll grind/cut down to be open face/nearly open face for next time. I didn't find any 5/16" ID slotted washers on McMaster with small enough OD. I tightened the screws to 20 Nm as per the manual. The copper was still visible. It should be easy to determine if there is a leak here (although it would be indistinguishable from one within the pumping system) by shutting the gate valve.