My rm2 on my Grand keeps popping loose in my pocket. When I go to screw it back in place I have to apply a lot of pressure to get it to catch. My first thought was that threads were stripped, but it threads onto my meter easily. My next thought was that when I did my rebuild kit on my Grand I didn't put the 510 connector in far enough, or maybe too far... I'm just not sure what's going on. All I know is it pops loose way to often. Any suggestions, reonauts?