Might it take long? Yes. (it doesn't take that long..) Take a drill, a thingy like mentioned above or some 510-510 EGO adaptors and 80grit paper (then some higher grade) and... some patience. And you're done.
Did it on some GT2s, on a GS2 and some others. I never liked too much knurling.
Tank would fall above the opening of the box as it's on STB's picture shown.