This is an L.C. Smith bar action 6 pin lock showing pins and or axles.

Zabala Derby 6 pin lock

Zabala Derby showing pins/axels. Note the 6th pin is a dummy pin. Since this has a coil mainspring, the 6th pin was most likely used for a leaf mainspring.

You can also see how the hammer screw pivots in the bridle and has an indexing to show fired and unfired position.

Most screw pins have a polished,rounded end to make them look like pins.

Last edited by JDW; 06/10/13 12:06 PM.
David