Hey there, knowledgeable bike folk. I'm trying to get a 5-speed cassette off a wheel from a Diamondback Curaca of unknown vintage (late 80s?)... and having no luck. My park fr-5 is too big, and I ordered a tool for older shimano cassette lockrings that may do it if I can get that bolt on the axel out of the way. When I wrench that nut, the nuts on the other side conspire against me and move as one right off the axel, at which point, despite ludicrous amounts of play, I can't yank the axel through. This has become quite frustrating. I'd appreciate any help on how to get this off.