Abstract: A tool for honing an axially facing annular surface surrounding an elongated shaft includes an annulus which is placed around the shaft and supports honing stones which are engageable with the sealing surface. Rods rigid with the annulus extend longitudinally from the back of the surface and the outer ends of the rods extend beyond the end of the shaft and are rigidly connected to a plate. The latter is adapted to be turned by power about the longitudinal axis of the tool so that the annulus is rotated about this axis and the honing stones polish the sealing surface. Radially adjustable fingers project out beyond the periphery of the annulus and engage a cylindrical wall surrounding the sealing surface to maintain the annulus centered with the sealing surface.