So, this is my first peep sight and usage of one. It came with my shorty T/C Hawken. As you can see in the pic, it is in need of some cleanup. Is this sight meant to come apart so I can clean some of the rust of that windage screw? I did verify that it turns and the sight aperture moves sideways. I don't want to try and disassemble it if its not meant to be taken apart. As always, any suggestions and help greatly appreciated.