From our customer Bill D.:
I have been using your bullet feeder for a few years and love it. I adapted one to my Dillon 550B machine. One common problem has been the very fine spring on both sides of the slider part which returns the assembly down as the fingers retract. I have found it very tricky and it often getting caught up with the activating arm to the left. Over time it has lost some of its shape and strength and doesn't push the arm down enough. Finicky for sure.
What I did was use a fine wire round weak spring and place it between the arm and mounting plate to the die and bullet tube. Fits right over and pushes down perfectly with even force. Nothing can interfere with the arm now as it used to. Might be something to consider in the future for an already excellent product. Some pics attached.