Hello everyone. I have been enjoying my provari for a couple months now. Still working like the first day I got it but I need a little help. I am not very mechanically inclined and I need a little help with the threads. What kind of goop do I need to get to put on the threads? It came with something on it that made the end cap screw on silky smooth. Lately, however, it almost feels grainy when I screw on the cap. I think I need to clean the threads (what should I use) and re-goop it with whatever stuff I need to go buy from the hardware store. Just looking for a little direction. I dont want to damage the threads in any way. I apprecate the help!