First thing you do is throw that junk plastic rod away, save the spring. Get one of these.
https://zrtacticalsolutions.com/walther-ppq-pdp-captured-guide-rod/
https://benstoegerproshop.com/sprinco-4-walther-pdp-ppq-q4-9mm-recoil-management-guide-rod-system/
I know many will say there's nothing...