The steel knob's started around 1942 if I remember correctly. They stopped around 1945. All due to rubber shortage because of the war effort. I think they used what they had in stock and when they ran out after the war, they went back to the rubber ones.
I may have my dates wrong, so someone will correct me if I missed by a year.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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