The Clip?
    

While some users might not like the idea of using a screwdriver to install coolers, I find that it's very useful. With a screwdriver, I'm able to control the position of the clip with high precision. This reduces the risk of scratching the motherboard or damaging nearby resistors or capacitors.

I tried installing and uninstalling this cooler several times and each and every time, I was able to do it perfectly.

However, the heat sink still moves around a little after installation because it only uses two hooks. Therefore, it's still advisable that users, especially those with Duron and Thunderbird processors, remove the cooler before transportation to reduce the risk of chip damage.
   

Here's the bottom of the heat sink with the provided thermal goo.