:grin: Not so sure I can help you,as I also shoot flintlocks quite a bit on occasion,ans sometimes mine will stick a little also. I am using FP-10 grease on mine when they are installed and have not had a problem with them. I do remove them everythime the gun is cleaned and really go over the threads with a toothbrush. It also is important to have the screwdriver fit it well so enough force can be applied without damaging the face of the vent. I also found that when I soak the inside of the bbl with hot water and have the vent plugged with a toothpick or similar object it comes out a lot easier. I hope this helps......stay safe...King