Hi, I am no newbie to LR atomizers or regular atomizers for that matter. I recieved a few brand new LR's today in the mail and immediately checked all of them... The one in question will NOT screw on to any of my 510 devices, I tried forcing it but got it stuck and had to use plyers to screw it off... Is this a manufacturing mistake? Should I return it? I already contacted the company... waiting for a reply...