A screwdriver for driving collated screws including a slide body coupled to a
for reciprocal displacement in a cycle including a retraction stroke and an extension
stroke. A lever pivotably mounted to the slide body carries at one end a cam pin
received in a cam slot in the housing with the other end of the lever advancing
successive screws in the screwstrip, the cam slot having first and second camming
surfaces for selective engagement by the cam pin to vary the relative positionning
of the lever to be different for the same position if the slide body in the housing
in the retraction strokes than in the extension stroke.