I purchased the 3D PRINTED .223 bullet feeder die the other day, and was having a little trouble getting it to function properly. So I emailed the Great guys at D.P.G and with their guidance , they helped me figured it out. They did suggest using springs instead of the rubber bands. So I took a ball point pen spring and cut it in half . It helped the die work a lot smoother. Still in break in period , so will see how it goes. THANKS D.PG. for your patience and help. I only found one video on line , but there's no audio , but you can watch the operation.