I am trying to disassemble my new trp to clean the internal parts. I can't figure out how to take out the recoil spring assembly. On the user manual, it says to insert the included pin in the pin hole of the guide rod. The next step in the manual says to remove the spring housing from the rear of the slide. How can I remove the recoil spring assembly from the rear of the slide with the pin sticking at both side of the rod?