I bought a Mavic Crossland wheelset, and am installing disc brake rotors on it. The wheels have Centerlock hubs, but I bought "Alligator" adapters, which have a central splined hole that slides onto the Centerlock wheel splines, and 6 short posts onto which slides the 6-hole rotor. A standard Shimano cassette/centerlock lockring holds everything in place. I successfully mounted the first rotor on my front wheel, but am having problems with the rear wheel. The Alligator, rotor, and lockring went on fine, but my off-brand (Torx) Shimano cassette tool w/guide pin (looks like Park FR-5G tool) is bottoming out on the end of the axle before I can fully tighten the lockring. Am I doing something wrong, or do I just need a better (deeper?) tool? Would the Park FR-5 tool (no guide pin) allow my axle through its central hole, thus giving me some more useful engagement depth for the tool splines?
The first photo shows the wheel + Alligator + disc + lockring; the second is a closeup of the lockring area, showing (in yellow) the approx depth at which my tool is bottoming out, and (in red) the approx working depth needed for a guide-less tool that can fit the axle through its central hole.