Just on a side note....the correct nipple is important to the alignment on this machine. The thicker stop wall of the Welker nipple sends the needle shafts straight down the center of the tube. A slight bend in the needle shaft down lower by the needle grouping is all that is needed to get good needle tension. If you visit www.welkertattoomachines.com and go to service there are a couple of videos that show proper needle setup and routine maintenance. Any questions or concerns contact me directly 248-667-6148...enjoy