Hi Mark,
Welcome to the forum. I hope you've been finding the information here helpful.
Phrobis III is no longer in business. As you have probably read elsewhere on the forum, Buck actually manufactured all of the Phrobis bayonets as a subcontractor. You can try contacting Buck to see if they will do it for you. I know when they were in California it was no problem to send one back to be sharpened. I don't know what their new set up in Idaho permits them to do.
http://www.buckknives.com/
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Honda RC144