Thank you Stuart. Will try your ideas. I don't remember the ferrule nuts shearing off when I first started in hplc around 1972. I wound up in R&D management and did not do much lab work after 1985 or so.

John

On Mon, Dec 12, 2016 at 12:45 AM, Stuart MacMillan wrote:

> Hmm, I once used and then sold that equipment. You can drive an old > knife blade or jeweler's screwdriver into the hole and twist out the > broken ferrule. If it resists, freeze it. If that fails, run really > hot water over it. This happened all the time because lab folks > constantly over tightened these connections. No miniature torque > wrenches. ;-) > > Stuart > > -----Original Message----- > From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On > Behalf Of John Lauterbach > Sent: Sunday, December 11, 2016 9:21 PM > To: vanagon@GERRY.VANAGON.COM > Subject: Re: NVC -- Need easy-out or similar tool for 10-32 stainless > steel bolts > > Thank you, Alistair. We do HO-gauge model trains so we have plenty of > small drills. > > John > > > On Sun, Dec 11, 2016 at 11:30 PM, Alistair Bell wrote: > >> Jeeze John, I threw out a bunch of HPLC fittings some years ago. >> Still have a few plastic odds and ends fittings which I think were >> from a beckman, but god I can't recall. >> Do you have a good set of small drills? Can you sneak up with drill >> size to drill out most of broken part and no damage femal threads? >> >> Alistair >> >> >> >> >> >>> 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