surgicalheadlightreasons:bearing damage;rolling bearingorbrackettocoverthe gap is toosmall;surgicalheadlight Thebentshaftortwoaxesofdifferentheart;tapetoo tight;short of oiloroilybad;impellerbalanceholes to plugtheimpellerout of balance,increasing thethrustto one side.surgicalheadlightRemedy:replacebearings;removal ofthe back cover,installation ofthegasketinbetweenthebracketand the bearing;investigationshaftor adjust theconcentricityofthe two axes;surgicalheadlightwith due emphasis onloosetapetight;fillinga cleanbutter, butteraccountedforabout60%ofthebearinggap;tocleartheobstructionofthebalancehole.