Yankee Spiral Driver--Help

Yankee driver anyone familiar with them?
I'm looking for a bit holder for one. I thought Stanley only made drill bits and flat and Philips drivers. I've looked on ebay and found some others but no bit holders. I'm wondering if anyone knows if they are available. Or if there is anyone who could mod a modern day bit holder to fit the Yankee chuck. The shaft has a right angle cut-out at the bottom and a little grove on one side less than an inch up from the end.
Thanks in advance for any sources or mod offers.

I didn't know anybody still used those things. I used one about 15 years ago.

I used to work for a safe and vault installation firm, I did installations and repair of some of the smaller equipment (safe deposit locks, time locks etc.)

I use to use one to remove safe deposit locks off the doors. It was faster then an electric screwdriver (15 years ago) and didn't run out of juice. But if you messed up it was a real knuckle buster! Try here

http://shop.store.yahoo.com/squaredrive/driver-bits---hand-drivers-bit-holders-yankee-magnetic-bit-holders.html

Thanks, I think that will be perfect. Plus I wanted it for square (Robertson) drive /ubbthreads/images/graemlins/grin.gif