I bought a package of drag tips for my Trafimet S45 plasma torch from ebay a few months back.

Yesterday I went to use the plasma to cut the bent tongue off of a trailer I'm fixing. Figured it would be the perfect time to try out a new drag tip, so I installed a new electrode and nozzle from the package, and they seemed to fit perfectly.

Well, the plasma won't ignite with the new drag tip installed. Tried several times, pulling the torch apart and reseating everything just to make sure. Even tried another brand new electrode and nozzle. I pull the trigger and get nothing but air...

The old nozzle and electrode work fine, so I know the plasma power supply is ok.

Any idea what's wrong?