Er..the problem is, my fan box does not come with any manual..lol...
Well, i kinda understand but its kinda hard to pull at the other end. Not to mention it will be hard to take it out next time. For now, i will stick with the supplied screw until i realise how good it is first..lol..Now try to search online to see how to fix those rubber thing..
And to keep my promise to bro irangan, here to drop some of my comments on the fans...
First of all, for those who are expecting great air preasure as like those of SS FM series, do step away. The Noctua fan is no where near the preassure of the SS..
The most surprising thing i get to know about the Noctua fan is that they are EXTREMELY silent. No, i mean, not even a slight sound produced.

They did an awesome job in creating this fan. People who are looking forward to a silent rig, really look no further. This should be the best available..In term of air preassure, it is quite good in my oppinion. Better than the very bad LL fans and almost on par with my previous Thermaltake fan which is quite noisy as well..Therefore, i am satisfied.
If you would need any info, once i switch over from my LL to the Noctua fan, the temperature of my HDD drop 2 - 3c which is quite good. Therefore, two thumbs up for this product. Looking forward to get one more for side intake once i get my hands on the LL side panel extension...
P.S. To some people, the color and design of the fan is weird but i am really in love with the color and design.So distinctive and beautiful..lol...Great money spent.
Actually it is quite easy to pull if you using a Player Tajam... and did you notice, the fan come with the adapter you want to get last time... which have a resister inside which make it to run slower...
For my case, my SATA hdd temp up 1-3C as the hdd cage block the air flow... the air tendang balik to the front mesh...
will install it to the cdrom bay after getting my fan holder from bombman...hopefully the temp will be lower... still trying to figure out how I am going to change some of the things inside to make the air flow better...
anyway, now the weather is hot...so no matter what I do also couldn't get the temp down too much...