Hello Moggy,
if you do it like you do in the Video it will not work. The clips are not too big, but there mounting or working is a little bit different. If you install the clip on your cooler and later on your mainboard you have to fit the notch on one side than on the other side: i did a picture for you.
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I hope this can help you a little bit?
Chris
Scythe EU GmbH