[rcheshire (Rowland)]

Glen. The copper retainers are removed. The sensor is located by two lugs into the sensor frame, and these hold things in place while inserting the cold finger - until such time as the 2mm screws are in place. You will need, as mentioned, 2mm deep collars around the screws for support, between the bottom of the cold finger and the sensor frame. Essentially, replacing the role of the copper retainers. So, yes the assembly can come apart in your hands, but I find the lugs hold things together quite nicely - I will look at pointing this out in the instructions.

Quickly knocked up a side elevation looking toward the cold finger exit point. I have a spare sensor on hand and the PCB EMI cover is attached at four points to the sensor frame. Very secure once all together.