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Hoss7504 Uncle @sdandrea1 posted a how-to. I found a site that sold a .370 drill bit, clamped the head with a bunch of padding, and drilled down the hosel real slow with also applying a little bit of drilling oil. Worked great for me!
Do not use a common 3/8" twist bit. Get a proper reaming bit. A twist bit can easily get hung up and send shit flying everywhere. Plus it will not get to the bottom of the bore since it has a point on it. A reaming bit is flat on the bottom and will chew small pieces of the steel away as it goes down.