This Velo Orange blog post links to an excellent and detailed Japanese post on cleaning Retrofriction shifters. Online translators of Japanese, unfortunately, are quite horrible.
*http://tinyurl.com/d25dv4
Luckily the exploded drawings require little translation.
Adam Hammond Toronto, ON, Canada *
On Tue, Feb 3, 2009 at 10:53 AM, Jack Fortune <jfortune52@gmail.com> wrote:
> My Simplex Retrofriction shifter which has performed flawlessly for
> several years has begun to slip. After my last ride I tightened the
> set screw sufficiently, I thought.
>
> The shifter felt tight when I started riding this morning, but after
> several miles the looseness returned.
>
> Is there maintenance that I should do? Should I simply try to tighten
> the set screw even more? Are there any links to an exploded drawing so
> that I can see how the parts fit?
>
> regards,
>
> Jack Fortune
> Eugene, Oregon USA