Craftsman Split-Blade Slotted Screwdriver?

[Bay_City_Exige]

Not sure if anyone has seen this before, but would love some input if anyone has any ideas. This is a Craftsman USA screwdriver, but the shaft is split - all the way. Has anyone seen this and know of the purpose? Is there a sleeve or something missing from the shaft perhaps, that would lock it or?

I picked it up for $.25 at a garage sale a couple weeks ago and have been staring at it...I can't find anything on this style from Craftsman, and the part number comes up blank for me.

To those who know:

 

[Bob-B]

Yes, there should be a sleeve with a knob up close to the handle that slides down the shaft forcing the tip to spread and hold the screw.

 

[larry_g]

It is a screw starter with the sleeve missing.
lg
no neat sig line

 

[DWise]

I have all 3 sizes of them and still use them, plus an off brand phillips.

 

[DWise]

They have a sleeve on the shaft with a plastic knob at the handle end that pushes the sleeve forward and spreads the tip apart to hold the screw.

 

[Basher]

Often referred to as
"screw placers"