I am going to buy a new prop and need some help figuring out which hub kit I currently use. Attached is a picture of my current hub kit, and in inside view of my current prop. I think this is a 501 kit but the online pictures are not consistent (this kit matches the pictures of some 501 hub kits but not all). Any help or advice is welcome. You may think hub is dirty but you should have seen before I cleaned it. Pictures also give you good idea of why I want a new prop!