Heads up for new owners of the Sparrows Vault: it's possible that the stepped two wheel gate (the one installed in your vault new) is slightly longer than two wheels and rides on the third wheel un-stepped. Try solving for the last two wheels before giving up, or getting frustrated. Trust your graph and finish the drill (even though the lock won't open with two wheels as it should from the box).
A little disappointed this tip wasn't floating around for me, graphed wheel two four times and didn't consider the tolerances could be (are) bad.