Have you changed a a PSU fan?

Prenote: I am a silent-PC-aholic
I am a bit obsessed with PSU fans at the moment, because I beleive
quiet PSU makers don't use high enough quality fans. ::not pleased::

To anyone who has changed a PSU fan:
How did you do it, and what problems did you encounter?

My first attempt at changing a PSU fan was on a 530W Hiper 120mm PSU.
I replaced the cheap tacky black fan with a lovely efficient Akasa
model.

Advantages:
It removed a boatload of noise and had my PSU running cool to the
touch.

Problems:
1) - I couldn't get the new 120mm in place properly; the problem was
the screws! It was impossible to screw them flush to the fan, because
the screw holes in the fan were not pre threaded. As a result there
were screws sticking half way out.
2) - Something (I did?) eventually caused my power supply to become
faulty by failing to dissipate static
electricity/ producing static.
3) - I had no way to check the operating temperature of the PSU to
make sure the new fan was doing a good job. (It seemed to be doing
well though.)

That's it.. please share any thoughts or suggestions you have!!
.

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