Looks like a #1 straight extractor is used for #10 screws.

http://www.irwin.com/uploads/documents/18_screw_extractor_selection_guide.pdf

10-32 has a minor diameter of about 0.15 and a pitch diameter of about 0.16 or about 4 mm to 5 mm.

Shouldn’t be too hard to find.

Your local hardware store probably has one.

On Dec 11, 2016, at 7:50 PM, John Lauterbach <john@JHL.MGACOXMAIL.COM> wrote:
> 
> 
> I am hoping for the wisdom of the list is locating an easy-out or
> similar tool for SS 10-32 bolts.  If any of you have worked with high
> performance liquid chromatography (HPLC) equipment (particularly that
> made by Waters Associates), you are probably familiar with so-called
> ferrule nuts.  These are hex-head 10-32 SS bolts with a hole down the
> center to clear 1/16-inch OD SS tubing.  Basically the 1/16-inch tubing
> is connected to pumps, columns, etc., with the ferrule nut followed by a
> ferrule.  You screw the ferrule nut -- ferule combination into a
> specially machine fitting and tighten it down to make a tight seal.
> This passed summer, I bought a collection of 1980s-vintage  HPLC
> equipment to teach my Son lab instrument repair and computer
> interfacing.  In the process of letting him learn by doing, he snapped
> the heads off a couple of the ferrule nuts leaving the end and the
> ferrule stuck in the equipment.  Parts involved are NLA so there is need
> for a way of extracting the remaining part of the ferrule nut and
> ferrule.  I can get the parts to a Dremel drill press to drill the
> tubing out of the broken nut, but then need something to extract the
> remainder of the ferrule nut.  Are there miniature easy-outs or similar
> tools?
> 
> Thank you,
> 
> John