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I'm assuming the loose spring is your mounting clamp.
I have a mod for a noctua fan.
But it's a fairly simple mechanism:

4 screws at the red arrows (not visible as they are inside the printed adapter).
Clamp fixates the shroud.
Shroud has the fan screwed on.

My power supply is unfortunately not accessible right now, but you should find the psu information on the monoprice website.