68GT... isnt there a stop knob at the back of the barrell to stop needle travel? I may have models confused, but most Grav fed do have a knurled knob at the end of the barrell tube. I also have an old badger 150 and a badger 350 that I started with, but I'll tell you now, once you start using the Gravity feed, you will love it. East to use, clean, fill and mix during use... I love mine and its not a real high dollar unit.