The Helicoil tap will likely run out to the very center of the flats of the boss. I would still try it before replacing the boss, as there is nothing to lose, and the hardened Helicoil threads should actually be stronger than the original threads. You may need to get a bottoming tap or grind down the end of a standard tap so you can run the thread all the way to the bottom of the hole. However, before trying the Helicoil, I would try Loctite's thread repair. I have used it on other threaded fasteners with excellent results.
Steve Barner, Boton, Vermont
> Date: Tue, 12 Aug 2003 15:45:17 -0400
\r?\n> From: "David Bilenkey" <dbilenkey@sympatico.ca>
\r?\n> To: <classicrendezvous@bikelist.org>
\r?\n> Subject: RE: [CR]Campy #660 braze-on control boss - repair or should I
\r?\n> replace?
\r?\n> Message-ID: <HBECIOPCNPKEJLCJBKNKMEPFGKAA.dbilenkey@sympatico.ca>
\r?\n> In-Reply-To: <001501c36109$2f874520$03000004@cinci.rr.com>
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\r?\n> Reply-To: dbilenkey@sympatico.ca
\r?\n> Message: 3
\r?\n>
\r?\n> Couldn't you repair the threads with a Helicoil? Or is it some obscure
\r?\n> threading?
\r?\n>
\r?\n> http://www.emhart.com/
\r?\n>
\r?\n> I've used lots of them over the years, on all sorts of things, I think the
\r?\n> last one was on stripped threads on an early 60's Campy FD cable clamping
\r?\n> bolt hole.
\r?\n>
\r?\n> David Bilenkey
\r?\n> Ottawa, Ontario, Canada
\r?\n>
\r?\n>
\r?\n> > -----Original Message-----
\r?\n> > From: classicrendezvous-bounces@bikelist.org
\r?\n> > [mailto:classicrendezvous-bounces@bikelist.org]On Behalf Of Steve Neago
\r?\n> > Sent: August 12, 2003 3:38 PM
\r?\n> > To: classicrendezvous@bikelist.org
\r?\n> > Subject: [CR]Campy #660 braze-on control boss - repair or should I
\r?\n> > replace?
\r?\n> >
\r?\n> >
\r?\n> > Hello,
\r?\n> >
\r?\n> > I have a Raleigh Team Pro frameset with a Campy #660 control boss
\r?\n> > that needs minor repair. Apparently, the previous owner managed
\r?\n> > to strip the threads on the right side control boss by inserting
\r?\n> > misalligned the #604/1 adjusting wing nut. The result is that
\r?\n> > the downtube shifter wing nut will screw in, but not tighten
\r?\n> > properly & causes unwanted gear changes.
\r?\n> >
\r?\n> > Do you have any suggestions on how I repair/redo the control boss
\r?\n> > threads without having to repalce the complete control boss? I
\r?\n> > can purchase a metric tap set, but the original threads are
\r?\n> > probably too loose. I do not want to have to glue the adjusting
\r?\n> > wing nut into the control boss. Also, I prefer not to use
\r?\n> > handlebar fingertip shifters.
\r?\n> >
\r?\n> > Any suggestions?
\r?\n> >
\r?\n> > Thanks, Steve Neago
\r?\n> > Cincinnati, OH