Thought I had just about everything to service my bikes. Wrong. Wife's rear wheel looked as though the cone was loose. Oh no it wasn't it was the freehub. Happens to be a no-name shimano copy where the freehub bolt is tightened from the non-drive side, and certainly isn't 10mm allen key sized. Bolt was lose, and couldn't do up tight. (checked threads were OK). Bolt won't come out as the bearing races stop that. Bugger, just ordered an 11m and 12mm on the safe side.