I think, they are the splined type like on car or truck wheels that you have to hammer in. The nuts are on the other side and you can grab the nuts and rotate the whole stud/nut inside the sprocket hub. I don't know how I could get the nuts off when the whole thing turns. If the three holes are messed up I assume, the hub assembly will have to be replaced. A new hub price isn't bad it's just whether or not I can get the old one off. Thanks Mech! ๐