[PlankflooR]

I bought one second hand, got it home and put an extension in it, and it fell back out. Thought, wtf? Looked inside the collet and it's missing the steel retention balls inside the collet. Does anyone know what size they are, or somewhere online I could find the size?

 

[PaliBob]

That is a sweet driver.
Perhaps Craftsman parts?
http://www.searspartsdirect.com/partsdirect/index.action