Now things get mixed up somewhat!Zimmer's Taf.XXVIII shows the Dreyse coupled needlefire locks and Franz von Dreyse's obturating needlefire cartridge,note the base wad, while Taf.XXIX shows Berger's lock and original non-obturating needlefire cartridge. Note, Berger's locks are not connected by a steel bar, but they have a side slot for the guiding/stop screw clearly visible on the Goehler rifle. Both the Berger and the F.v.Dreyse cartridges needed a true firing needle as shown in both cuts. Collath's cartridge which had the "needle" inside as a part of the cartridge used flat-faced conventional-looking strikers, a bit longer than normal for real centerfires, to hit the "nail" inside the case. Of course, both needles or Collath strikers were easily replaced by firing pins when the guns were redesigned to use centerfire cartridges, as done with the Berger locks to the "Fuerst-Pless-Gewehr". Dreyse's design never made the conversion to centefire: As both mainspring had to be compressed by hand at the same time, the possible strength of the single mainpring was insufficient to dent a metal-capped primer reliably.