Since the bevel is so small , and the surface of the c'bore is hidden by the bolt, I don't think we can see enough to declare that the finish of the c'bore matches the original anodized surfaces.
I imagine the center bolt is threaded into matching threads added to the spring anchor (what's the correct name for that part?). There must be a shoulder on the bolt which bottoms-out against the front surface of the spring anchor. Washers could be added if the bolt proved to be too tight against the brake arms.
The bolt does look like titanium, but it's not necessarily an old conversion - lots of places can make bolts like this today, so it might be a recent conversion of old brakes. Maybe the original holes were worn (wallowed-out, ovalized)??? This would be an interesting way to fix them, if you had access to a small cnc mill.
Aldo Ross
Middletown, OH
USA
<classicrendezvous@bikelist.org> Sent: Monday, January 29, 2007 5:17 PM Subject: Spam:****, RE: [CR]Unusual Campy caliper modification
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>
> it's to clean, by that I mean the bevel it has on the entry, The finish
> is even with the rest of the caliper. Think about it, if it where done
> after the fact there would be inconsistencies with how the surrounding
> metal appears along side the newly drilled and beveled hole.
>
> georgeargiris
> sandiego,ca
>
> -----Original Message-----
> From: Tom Dalton [mailto:tom_s_dalton@yahoo.com]
> Sent: Monday, January 29, 2007 2:12 PM
> To: George Argiris; Classic Rendezvous
> Subject: RE: [CR]Unusual Campy caliper modification
> =09
> =09
> George,
>
> Can you tell us why you think so? To me it looks decidedly
> aftermarket, though well done. The mod is one machining step (a simple
> contersink) followed by replacement of the centerbolt. The bolt itself
> has a finish that I have not seen on anything from the Campy factory.
>
> Seems OMAS-y to me, but OMAS already had a centerbolt mod. It
> was more conventional and this isn't it. There is that other company
> from Bologna that made SL tidbits, but I don't recall their name. Or
> could it be early ICS?
>
> Tom Dalton
> Bethlehem, PA, USA
> =09
> George Argiris <George.Argiris@mitchell.com> wrote:
>
> Sure looks like factory work to me
> =09
> georgeargiris
> sandiego,ca
> =09
> =09
> -----Original Message-----
> From: classicrendezvous-bounces@bikelist.org
> [mailto:classicrendezvous-bounces@bikelist.org] On
> Behalf Of Tom Dalton
> Sent: Monday, January 29, 2007 1:30 PM
> To: Classic Rendezvous
> Subject: [CR]Unusual Campy caliper modification
> =09
> =09
> I'm wondering if anyone knows anything about the unusual
> centerbolts on
> the Record calipers in this Ebay auction. It looks like
> the arms had to
> be modified (countersunk) to accept the bolts. Also, I
> see no way to
> lock in the centerbolt adjustment, other than tension
> from the mounting
> nut (no Modolo-style set screw, or Shimano-style
> rear-mounted locknut).
> =09
> =09
> Who made the bolts? What material are the bolts? Did
> these work?
> =09
> The calipers are late 70's, or perhaps very early 80's.
> Are the bolts
> form the same era?
> =09
> =09
> =09
> =09
> http://ebay.com/
> a
> me=ADME:B:EF:US:11
> =09
> Item # 150083797824
> =09
> Tom Dalton
> Bethlehem PA USA
> =09
> =09
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> =09
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