All- Back in the Day the shop I worked had one of these tools in the Campy tool box (just floating as there was no nest for it.) It was explained to me that it was to loosen and tighten the lock rings on the frame cutters for their removal or replacement.
And, yes, as you slide the knob along the slot the arms extend form the body and their pegs width apart gets greater. My memory is of a spring loaded movement.
<classicrendezvous@bikelist.org> Sent: Tuesday, February 02, 2010 5:55 AM Subject: Re: [CR] the HOLY GRAIL-Campagnolo tool for Bianchi etc headsets
> Hi Ted et al.
>
> Does this tool come apart? I'd be curious to see what's going on inside.
> How does it work? Do you pull the knob to slide the arms into the body?
> Does the taper in the body bring the arms together? Is the knob
> adjustable i.e. threaded like a nut to tighten and lock the arms in
> position? How are the arms and knob connected to one-another?
>
> Overly-curious minds want to know :-)
>
> Aldo Ross
> Middletown, Ohio, USA
>
> ----- Original Message -----
> From: "Bob Freitas" <freitas1@pacbell.net>
> To: "CLASSIC RENDEZVOUS" <classicrendezvous@bikelist.org>
> Sent: Tuesday, February 02, 2010 12:06 AM
> Subject: [CR] the HOLY GRAIL-Campagnolo tool for Bianchi etc headsets
>
>
>> TED ERNST sent these photos to me showing the Campagnolo tool
>> for Bianchi (and other) headsets that use a pin tool to adjust them.
>> I have heard of these tools for years but this is the first time I
>> have actually seen one. I know of one other in existence but there could
>> be others
>> Dale should put this in the rare parts section of the CR
>> main page because it certainly is
>> BOB FREITAS
>> MILL VALLEY,CA USA
>>
>>
>> http://www.wooljersey.com/
>> _______________________________________________
>>
>
> _______________________________________________
Andrew R Stewart
Rochester, NY