Upon further inspection of the throttle body, the wear on the pin wasn't the issue. I elected to leave the pin alone and instead concentrate on the throttle bores and butterfly plates where the sticking was occurring. I bought a cylinder hone and was able to remove the grooves in the throttle bores without removing much material. (Maybe around .005" or so from the diameter.) After honing the bores I used some sand paper and metal polish to clean up the edges and re-fit the butterfly plates to their bores. They're not a perfect fit, but it's a lot closer. Most importantly, they no longer stick!
While re-assembling I used red loctite for the screws, and put dry graphite on all the wear-points.
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