I am not really recommending this as a fix but when I had a bad screw hole in my JD A I could not seem to repair it. Not wanting to go with a screw missing I was at a loss to fix it. My desire to fill the hole with braze and re-tap kept failing because the braze did not bond well to cast. So I ended up electroplating the hole with copper by filling the hole with some acid and suspended a copper wire with a small charge. After a few hours I had built up a small copper coating that I believe helped the braze adhere well enough that I could drill and tap the new hole. I firmly believed the copper helped. I was able to apply the same torque to that screw and its still holding.
I had tried this on a spare piece of cast iron I had first and then repeated the process. So I guess I can say I did it twice.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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