On Jul 17, 2007, at 10:15 AM, Tom Dalton wrote:
> The last generation of NR and SR ders had this revised spring
> placement. The earliest SRs that I've seen like that were marked
> Pat 84. All the 85 and later units were unmarked, or possibly
> marked Pat 11, or Pat 22, and as far as I can tell all of these
> have the revised body spring. So, short answer is that it is a
> post 1984 NR that you have.
>
> There are at least two, and I think three, types of body pins.
> The type you're talking about is the last type. They were
> removable with a punch, of you drove them from the knurled (non-
> peened) end. I suppose they were reusable, provided that the
> knurled-end holes in the upper and lower body did not become
> oversized.
>
> Tom Dalton
> Bethlehem, PA USA
The revised spring placement was introduced with the Campagnolo 50th Anniversary group in 1983 (50th Anni rear derailleur stamped Pat 83).
Chuck Schmidt
South Pasadena, CA USA
http://www.velo-retro.com (reprints, t-shirts & timelines)