Quick question... I just received this subtank as my first rta and I'm very excited about building it... So far I have 28 gauge kanthal and organic cotton... Could you tell me how many mm the blue screw driver is? And what do you recommend if that's too small... Because it seems too small... How many wraps on what diameter drill bit? How many times should I dry burn it? Any other advice would be greatly appreciated... Thanks in advance!!!!