Andrew Gillis wrote:
>
> Chuck, et al:
>
> In college (1977 or so), I had overhauled a NR rear derailleur and had
> greased the limit screws with Phil Wood grease. After the first rear wheel
> catastrophe (chain in spokes), I recall re-verifying that the upper limit
> screw wouldn't stay put when it was greased. I subsequently had no drift
> when I overhauled the NR RD and used oil instead.
Andrew,
If you check a Nuovo Record rear derailleur you'll see that the upper limit screw has a _very_ hefty coil spring in compression to hold the screw's adjustment. It is impossible to turn this screw with your fingers because the spring is under so much compression. Go try it (I just checked five of my bikes).
Even if the upper limit screw was missing its spring to hold its adjustment and it did vibrate and turn, it would move downward and increase the distance keeping the derailleur out of the spokes!
Chuck Schmidt SoPas, SoCal
.