So I got my Smok TFV12 tank a couple months ago, and the pack that it came with included a RBA. I used the prebuilt coils for the first couple months before I moved onto the RBA. For some reason, The threads on the top of the coil seem to be stripped and will not screw into my tank. All of the other coils I have attempted to use with the tank have screwed in perfectly fine. Does anyone have any suggestions on how to fix this? Or do I just need to invest in a new RBA coil head for the tank.