Suddenly one of the focusing gear tracks on my 8x10 Ebony is binding up. Even with the locking knob loose it's hard to turn the focusing knob, and when I do a grinding sound is produced. I seem to recall reading that the gear tracks should be given a single drop of oil, but I'm not sure if I'm remembering accurately. At any rate, I could use some advice on how to free up the gears so that they turn smoothly.
Thanks!
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