I was looking at my cassette just now because I’ve been having problems with something slipping when I pedal hard trying to get up to speed. It only happens when I’m using the smallest cog. It feels like it shifts but when I take a look at the thing it is still in the same spot. I see two or three teeth that have small burs on the side that the chain pulls on. I’ll get some pics up as soon as I can. Do you think the burs would cause the slipping?