Hi all, I found this Optimus 99 clone with who knows what kind of fuel and gunk in the tank. I’m trying to do a full tear down but the darn burner assembly won’t come loose! I have a 10mm flange wrench and a torch and all I’ve managed to do is chew up the corners on that nut! Am I missing something here? Had the threads soaking in wd-40 the night prior too. Or maybe do you fellas have some advise on cleaning the tank while keeping the wick in place? Thank you in advance for your guidance.