Just so. The Huret bolt has no shoulder, so if you tighten it all the way down, the derailleur can't move. Huret really loved adjustable lock nuts. They put them all over the place where other manufacturers just used fixed length parts. It does allow you to set the play exactly.
Louis Schulman Tampa, Florida USA
Jerome & Elizabeth Moos wrote:
> So why was this necessary on threaded DO'S? Campy NR/SR and Japanese RD's didn't need such a nut. I believe on those RD's the thread on the upper pivot bolt bottomed out against the DO just slightly before the RD body was pulled against the DO, allowing free movement of the RD. The nut on Huret, except in the case of unthreaded Simplex DO's, would only have been required because Huert failed to design the pivot bolt with the proper length of threaded section.
>
> Regards,
>
> Jerry Moos
> Big Spring, Texas, USA
>
> --- On Wed, 9/23/09, iamnofred@aol.com <iamnofred@aol.com> wrote:
>
>
>> From: iamnofred@aol.com <iamnofred@aol.com>
>> Subject: [CR] Fwd: More Huret Jubilee Mysteries - Can Anyone Solve ?
>> To: classicrendezvous@bikelist.org
>> Date: Wednesday, September 23, 2009, 5:38 PM
>>
>>
>>
>>
>> The small nut inside the DO was there to lock in the DO to
>> allow the derailleur to pivot freely.
>>
>> ?
>>
>> In overcast 80 degree lovely riding weather
>>
>> Gary Smith
>>
>> TLC for Bikes
>>
>> Raleigh NC
>>
>>
>> -----Original Message-----
>> From: John Thompson <johndthompson@gmail.com>
>> To: Classicrendezvous@bikelist.org
>> Sent: Wed, Sep 23, 2009 6:05 pm
>> Subject: Re: [CR] More Huret Jubilee Mysteries - Can Anyone
>> Solve ?
>>
>>
>>
>>
>> Jerome & Elizabeth Moos wrote:
>>
>>> [the] Jubilee, I believe had different bodies for each
>>>
>> DO type, with
>>
>>> the tab for the stop actually incorporated into the
>>>
>> body.
>>
>> The one Jubilee I have here does not have a stop on the
>> body, instead
>> using the familiar tabbed washers to accommodate different
>> dropout types.
>>
>>
>>> The other strange thing about the Jubilee, and maybe
>>>
>> other Huret
>>
>>> RD's, is it usually came with a nut that threaded onto
>>>
>> the pivot bolt
>>
>>> from inside the DO. This was somewhat like the nut
>>>
>> used by Simplex
>>
>>> RD's. But in the case of Simplex the nut was
>>>
>> used because the RD was
>>
>>> primarily designed for Simplex DO's, even though
>>>
>> Simplex RD's work
>>
>>> fine on Campy and Huret DO's as well. Simplex DO's
>>>
>> were unthreaded,
>>
>>> so the nut inside the DO was the only way to secure
>>>
>> the pivot bolt to
>>
>>> the DO. But I'm pretty sure I've seen Jubilees
>>>
>> with the nut, even on
>>
>>> threaded Huret and Campy DO's. Anyone know the
>>>
>> purpose of this?
>>
>> This was also used on some Duopar units. The small,
>> Allen-headed bolt
>> threads into the back side of the mounting bolt, which is
>> longitudinally
>> split on the threaded section. The small bolt has a tapered
>> head, which
>> fits into a tapered recess on the back of the mounting
>> bolt. When
>> tightened, this spreads the mounting bolt, preventing it
>> from loosening.
>>
>>
>> --
>> John Thompson (john@os2.dhs.org)
>> Appleton WI USA