Not new to vaping but I am just getting into modding. My first attempt will be a small 2aaa box bottom fed PT. I really like vaping while commuting but dripping gets a little risky at times. Also I go thru PT cords at the rate of about one a month. With a mod I can repair the cord as needed. Anyways my only uncertanty is the guage of the hole on the bottom of most attys. I want to get some hollow stainless piercing needles for tubing but can't decide on what size to order.