shewe: I realize this will not make alot of sense, at least it doesn't to me, but the instructions w/ them tell you to A. use a wrench and crank em tight, B. Spin them and check for run out, C. If you find any wobble/run-out, loosen them, spin the washer and re-tighten/re-check. For some goofy reason, it works, but don't assume they are perfectly ready to go when you screw them on. The run-out/wobble is the only thing that matters w/ them, and about one outta five of mine needed tinkering w/.