Thanks guys!
I never thought of using a hairdryer!
3oh6: You mean removing the pins from a 4pin molex connector ? It's pretty easy you know. Take a 4pin molex and look into the connector. You'll see that each pins has 2 metal clip on sides that refrain them from being removed through the bottom of the molex connector. Now, if you take a cutter or razor blade or paper-clip and push-in those meta clips, you will be able to remove the pin through the bottom of the molex connector.
Then, later if you want to put back the pins, you just have to ply back the metal clips on the sides of the pins (Like you have to do for a 3pin fan) and insert them back. When inserting back the pin into the molex, at some point you will ear a "click" sound. This means that the pin is correctly sitting into the molex connector.
Pics:
See ? Is pretty easy!