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Originally Posted by ChrisH
The tool you are looking for is called a broach. A broach with the appropriate width will give the shape hole you need. I don't think broaches are terribly expensive, though I must admit our machine shop has never made us pay for one.
Either that or find an EDM shop nearby. It is a small enough job you might get it done for free if you ask nicely and the machine is idle at the moment.
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They can be... I needed a hex broach last year and it ran upwards of $115. That should be cheaper though
Im sure you could definitely get a shop to do it for you for free or a reduced price.