From my own experience in getting some tough ones free, a quarter inch hole drilled through the center section right at the point where the end of the knee tube rides inside the center tube allows penetrating oil to get just where it is needed most. The axle knee tube is " belled" on the end and there is little clearance between the outside diameter of the knee tube and the inside diameter of the center tube. Drill the hole just through the top side of the center tube, put in some oil and heat it good all the way around the center tube where the end of the knee tube will be on the inside of the center tube. The rustiest place will be on the bottom insides of the tubes due to water going in the adjustment spacing holes of the knee tubes. Once you get the knees out, clean and sand inside of center tube and outside of knee tubes . Spot of welding to close the small drilled hole, grind it smooth, paint where needed and lube things good before putting back together.
I remembered seeing this discussed on Red Power a few years ago. Here is address to site. They had some good ideas .
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Today's Featured Article - Antique Tractor Solvents - by Curtis Von Fange. Solvents play an important role in keeping our tractor clean and running efficiently. There are many different types that can be used for external and internal cleaning of the various tractor parts. Being aware of the different types of solvents will make any cleaning job go easier because one can select the correct cleaning agent for the task at hand. Let’s take a quick look at what is available and readily used in the solvent larder of our shop environment. The most universal solvent in
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