I just used needle nose pliers and broke it off. Im ghetto.
There are MUCH better cases out there for watercooling. Antec 900 is one of the better air cooling cases actually. With the PSU at the bottom, there isnt much room for anything bigger than say a single 120mm rad.
EDIT: Holy shoe horn batman!!! Nice! Those pics never came up when I made that post. now im wondering if I can mount my 120.3 like yours... I think I just need to move my DVD drive down a couple notches....
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