So I ground down the protruding metal on the bolster with a bit I already had that was similar enough to Mike's. It took a long time, so perhaps it wasn't the exact tool for the job but I got it done. I followed the grinder bit with a file, then sand paper and then steel wool to smooth and polish everything.
Before:
IMG_20140716_083738.jpgIMG_20140716_083725.jpg
This is what I ended up with:
IMG_20140728_210240.jpgIMG_20140728_210228.jpgIMG_20140728_210247.jpg
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