I read a book on blacksmithing where the author had gotten a cherry job in the military by betting his sargent he could "drill a square hole". He made a tapered triangular bit, drilled and filed a square hole in a guide plate, attached the guide plate to the work, and allowed the work and guideplate to float while he drilled slowly on a drill press. He got the job.
That being said, quit being a wimp 8^) and get a couple of new (sharp!) quality files and get to filing. It won't take long once you get going. I would buy a couple of Nicholson 4" or 6" ba$tard cut square files with handles and get to it.
Keep your files separated and not loose in your toolbox. They will last a lot longer that way.
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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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