MAS p360 Issue: Please help

Need an illustrated/indepth guide:

How to replace or cut the hard spring that comes with the p360.

This stick I just got from mas is just way too hard. Where exactly is the spring? What does it look like? And how do I adjust it without ruining it. The wires are all soldered in. Any way to replace without re-soldering? Please help a noob. THX IN ADVANCE.