Hi Guys., After reading your suggestions I looked again at my reproducers. The Diamond B that I have looks like it was grinded down with a Dremel tool and it is a bit uneven so it doesn't drop perfectly in and out. Sounds great to my tin ear though. The O that I had looks just like the O that I just got. Neither one of them look like they were shaved but they don't have any plating on the sides so maybe they were. The O that I had goes in but it's not perfectly flush with the top of the carriage. The new O still goes down only part way.
What would be best to use for taking off some metal? A flat file, sandpaper,or a Dremel?