I have one of the CO2 dischargers Ive also used a worm (AKA male threaded insert for the rod). Just sorta depends on where I'm at and what I have on hand as to what method I use...

I just might track down a spent patch or 2 after a shooting session and look for tears-holes before giving up entirely on the .015 material. Iffen you have holes then it might be best to swap to the .01

D.