After spending some time depressed about my thermistor problems I have returned to my Felix with great hopes. I initially bought a 2.0 to 3.0 upgrade kit which was delivered the same day that Felix announced the 3.0 to 3.1

So I promptly ordered the additional upgrade bits and proceeding with the upgrade. However I have hit a snag and I am wondering if anyone can offer some advice/assistance.
In the 3.0 to 3.1 upgrade kit manual there is a very brief discussion about replacing the Z-Axis calibration part and there in the image I noticed a part (in the green circle of the image below) that was included in the upgrade kit even though it isn't on the front page of the 3.0 to 3.1 upgrade manual where the bill of materials is shown.
I checked the 3.1 installation manual and it doesn't show how the part affixes to the bolt (M4x25 I think). Does anyone have any suggestions? I would very much like to have this very fine control of adjustment without having to resort to a tool and I will find some way to glue it on if necessary but I do hate using glue when its not needed as it is more a kludge then

Image below from the 3.1 Assembly Manual 20150713