pin stuck in steering coupling

Spent 6 hours trying to remove the in on the coupling with no success. Trying to remove the power steering box in order to rebuild. Tried pounding out with numerous punches, screwdrivers, rods, nails, etc. Also tried drilling but I only wood bits.

Also tried removing steering column but it attached inside the coupling.

It’s a hollow tube pin that I guess was machined into the coupling. Any ideas how to remove?

I’m thinking of investing in a steel drill bit.

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