Are the RBAs in the STM the "Plus" version (large side holes) or like their photo, which shows the original version? The Plus version uses a screw to hold the chimney on.I just received a pair of Subtank Minis and Nanos yesterday from vapehappy and look forward to using them at lower wattages. I'm going to get the rba heads for the Nanos from fasttech so I can start playing with coils on both as well as learning to rebuild the stock heads to my liking. It's good to hear they've worked out for many, as they seem as common as the Vision Vivi Novas once were. That comes in handy!
Thanks