[Alex, Daniel]
 

We tried installing a CF 4.5" Flange to KF 50 adaptor on the Agilent TwisTorr 74 Turbo Vacuum Pump for the SNSPD Dewer, but found the diameter of the pump is large enough to prevent the use of the plate nuts. The pump bulges out, so 1.75" long, 5/16-24 screws cannot fit with their heads close to the pump. 1.5" long screws aren't long enough to engage with the (plate) nuts. I bought some non-plate 5/16-24 nuts, some with a built in washer (a flange nut, but the flange in this context doesn't refer to the CF Flange) and some regular nuts.