Well, there's always a way to save this old stuff if your pockets are deep enough.
A good machine shop that has a CNC horizontal mill would be a good place to start asking questions about removing the gear. They should be able to use circular interpolation ( computer guides milling cutter in a circular path ) to cut away the weld. I don't think a large lathe is going to be an option with the flywheels still mounted and in the way.
If you are going to talk to a shop, do it BEFORE you start torching away at the gear. Sometimes torching can leave metal harder than hell . Ask them if you can save them time by torching first.
As to the taper pin, I may be able to give better advice if I knew where it was located . I can offer that they are case hardened and can be drilled after you get past the hard outer skin.
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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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