A spark erosion tool includes an electrode arranged on a tool longitudinal axis and an electrode holder aligned along and arranged on the axis and connected to the electrode. The electrode holder includes a moving device for moving the electrode relative to the electrode holder and includes a press for applying pressure transversely to the axis in the area of an imaginary hose extending in the axis. The electrode holder has a cross section corresponding essentially to the electrode. An electrode for a spark erosion tool with a cylinder surface or a spherical surface includes a groove connected to a bore. A deflecting bore can be produced in a drill string part using the spark erosion tool. The deflecting bore is curved and connects two straight flushing bores.