In article ,
"David Farber" wrote:

I got this set a while ago, probably in the early 1980's. It's a Sony combo
screwdriver and bit. The photos are he

http://webpages.charter.net/mrfixite...crewdriver.jpg

http://webpages.charter.net/mrfixite...s/Sony-bit.jpg

The question is, how does the bit lock into the driver?

I think that what you're calling a collet is spring-loaded. You would
pull it back towards the handle to insert or release the bit. Possibly
rusted and frozen up.