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 - Choosin, Mounting and Using a Bush Hog Type Mower - by Francis Robinson. Looking around at my new neighbors, most of whom are city raised and have recently acquired their first mini-farms of five to fifteen acres and also from reading questions ask at various discussion sites on the web it is frighteningly apparent that a great many guys (and a few gals) are learning by trial and error and mostly error how to use a very dangerous piece of farm equipment. It is also very apparent that these folks are getting a lot of very poor and often very dangerous advice fro
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