second stage service

Hi guys. I use an Apeks ATX40 with a DS4 on my stage cylinder and diving in cold water (16 deg C down to 2 in the Swedish winter). Last winter the second stage freeflowed often and this disappeared when water temperature became higher. I swapped the second stage for another one and decided to...

Looking for opinions on the reuse of low pressure seats. I have a few second stages for which service kits are hard to find or not available (Davor Vyper) but even Scubapro R190 or R380 have flat poppets/low pressure seats. If the back side is still flat and unmarked it should be OK to reuse...