I have straighten many of them. Heat them up slowly to keep the threads in as good as shape as you can. I always leave them together. The end and center gives you something to press on. I also have a bronze block I put on the threads to push on.
When I get them straight I then take it apart. Then I reheat the straightened area to cherry red. Then slow cool it in a bucket of oil. Dip it in and pull it out. Few seconds in and 5-10 out. This will heat treat it but not to glass hard like watered cooled will do.
Then I have a set of thread files that I use to clean the threads up with. You usually can get them to work as good as new if you take your time.
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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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