On my Arca Discovery I find that the levels on the front and rear standards do not quite agree. This is not so terrible. However, a level placed on the rail does not agree with the levels on the standards by a larger amount. And when I place my Starett precision level on the ground glass it does not agree with the level on the rail. I returned the camera to Precision once (the front swing lock was loosening when I tightened the tilt) and they took care of this stuff. I think. But shipping the whole camera back to them for alignment gets expensive and time consuming. I have e-mailed Precision asking for instructions to do this myself, but in the past they had me send the whole camera. Does anyone know how to do this? Is there a manual somewhere? Or maybe it doesn't matter (but I think it does). Any and all help would be appreciated.