> Thanks,
>
> Sorry for the quality of the picture - my camera is out of batteries,
> so I used my phone. I'll take a better image later on.
>
> The screws I'm interested in aren't the one's in the heatsink, but
> rather the one behind, in the square, and connected to the case, but
> to nothing else - just seems strange to me.
>
> Many thanks for you help.
>
> TJ

Florian's comments are 100% correct. The heatsinks have internal female
threads. So there is no nut required at this position. But the other side of
the 4 standoffs (i.e. the female threads of the standoffs) have to be
mounted with 4 screws at the rear side of the suitcase.

Just to be sure: can you confirm that the power supply is mounted by means
of 2 screws only to the rear side of the suitcase (not 4 as it should be)
If this applies I ask you to take a picture from the rear side of the
suitcase that shows the two unused mounting holes.

Best wishes
Dieter Doepfer