On Aug 24, 9:28*pm, "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? There is nothing to
twist, turn, or tighten. For years, I just used masking tape to hold it
together. Then today, I decided to search the net for answers. I found that
MCM still sells this. There is a picture he

http://www.mcmelectronics.com/produc...M-7-700-752-01...

It's obvious that my driver has an extra piece in the handle. So what's the
story here?

Thanks for your reply.
--

David Farber
Los Osos, CA

The semicircular groove around the upper part of the bit suggests a
sprung ball inside the collet, and this has fallen out, as happens
regularly with modern equivalents.

Alternatively, maybe there was a magnet at the bottom of the collet
and this has fallen out, demagnetised, or got pushed in too deep.

Either ball or magnet may have been accidentally omitted in
manufacture.

Just my three-ha'p'th.

Chris