I'm wondering if the reason they all seem to break in that spot (V2 anyways) may be the way people dissasemble them. Every person I've seen taking one apart tends to remove all screws and then pry open the box starting from the rear or from the bottom where the motor mounts. This can put stress on that point when done repeatedly over time. I try to open the front first as it also helps prevent everything from flying everywhere. I'm not saying this is the only reason, but it could be a part of it. Whatever spring or mechbox type you want to use, a silent piston head & cylinder head will definately help cushion the blow and give your mechbox a longer life span.
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