Well, you just pull it from both ends.
Think about when you were in school and you'd dismantle a pen and get to the spring - you would pull that shit from both ends and the coil would strech out and there wouldn't be a lot of tension making that spring/bounce weaker.
If you compare most aftermarket springs to stock springs - you'll notice they are smaller in length and a tighter coil.
Mind you - this probably wont make much of a difference and you're probably just better off buying an s110 / s120 to get you around 400fps.
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