When did Ford cease drilling the hole in the frame and controller shaft bracket for oil, and when did they restart doing it again? I recently bought what I believe is a 1919 frame and controller shaft, and neither has the hole for oil.
I had frames without the oil holes but all the lever assemblies had oil pockets
My guess is the holes didn't get drilled in the rails
My last lever assembly had felt oil wicks in it from the factory
You are trying Bob, but that doesn't answer the question. I can't comprehend why Ford would have ever dropped that important item. Obviously they found it important, and that is why they brought it back, but when?
You may find something in Mark Herdman's study of frames:
From his study it seems the oil holes were omitted from the mid of 1920 until the mid of 1922.
Note: He has studied Canadian made frames found in Australia, so differences from US production is expected.
Return with us now to those thrilling days of yesteryear and scroll down to the 8:25 AM entry for March 24:
At least it's a partial answer.