Thanks for all of the responses!! It seems like a crisis was averted! Good thing I didn't use that crazy brush inside the valve casings or on the outside of the valve itself! mrsemman: there are two holes with the scratches. One is the bottom-most hole of the second valve that leads into the third valve (but I don't think it is used when the valve is pushed down - I think). The other scratch is in the top hole that leads into the second valve slide (but it becomes the bottom hole leading to the second valve slide when the valve is pressed down). I am not quite sure what a burr is, but the scratches in the holes end before the holes themselves end, and nothing juts out of the holes (from the scratches) into either the second valve slide or the third valve. In looking inside the second valve casing, around the second valve slide, I did not see anything jutting out - just the two holes inside the casing the lead to the valve slide. They are flush with the rest of the casing. I could not fit my finger down there to feel them. Does that answer your question? If so, does that alter what everyone else is saying? I did notice that inside the second valve casing, in the top hole leading to the second valve slide, there does appear to be some tiny tiny pitting (like two or three microscopic INWARD dents) on the bottom rim of the hole. I am not sure what that is from, but it is certainly not from the scratch that I caused inside the hole of the valve itself (it wouldn't be possibly because it wouldn't match with the location of the scratch in the valve hole). I wonder what those were from (remember, this is a used horn). Fweew! That was a lengthy explanation!