Need name and source for a tool

Ed,

I've always called them an "easy out" or "screw extractor" . Try

http://www.microfasteners.com/catalog/index.cfm

I have also cut a slot with a rotary tool in the screw to use a small screwdriver. You may not have enough exposed screw to do that.

Malcolm

Grabit.

any motorized extractor may worsen the problem unless it is REALLY slow.

a manual easy-out or Malcolm's slotted solution is what I usually try.

though boring a hole into a 2-56 screw does require a steady hand and a magnifier.

Left hand drill bits, counterclockwise rotation, should also be added to the list of possible solutions.  There is a chance this type of drill bit will remove the broken screw.  Trouble with most extractors, when they grab the screw from a pre-drilled hole they expand the screw making it tighter in the threads.  IMO. 

A lot of times you are removing the broken part with a drill bit and tapping the hole to the next size larger. 

I never have had any luck with the various screw extractors on the market. I most recently tried a Moody tool from this set. (It was a holiday gift) It did not work.

Occasionally, I have been able to drill out the center of a stuck screw, and poke loose the remaining part with a probe.

Some times the drill will get stuck to the screw. I stop the drill immediately, and hand turn it backwards, and often the screw comes out with it.

Several folks have mentioned left hand bits. Sounds like they would be worth a try.

In my case, The screw heads are usually broken off because the threaded body was stuck in it's hole, and someone (usually me) continued to turn it. If the body is stuck enough to break off the head, I guess it would be kind of tough for a tool to remove the body.