The initial batch of Six Pack Pro presses were sent out with a red or black Slider Hold Down # BP5345 installed at the end of the primer slider rail. This was used in conjunction with the # BP5079 Primer Slider (1.985" long). The Slider Hold Down prevented the Primer Slider from curling up during operation.
On November 14th, we made the switchover to a longer primer slider # BP5353 (3.144" long) and primer feed spring # PR5343. This new primer slider works on all Six Pack Pro's. The red or black Slider Hold Down is not required to be installed when using the new primer slider.