Actually any mechanic will do. I am replacing the Tine shaft,tine holders ,bearings,seals,and bronze worm gear,on my old reliable Troy Bilt pony.With the exception of one gasket I finally got all the parts together.Most of the parts are no longer available from Troy Bilt since they merged with MTD. Anyway ,do I need to lubricate or used any sort of gasket sealer on the bearing races and shaft seals before installing them ? I dont have an arbor press so I assumed I can carefully tap the races into place. Thanks .