My new brand name 3/4" wide shoulder plane arrived machined perfect with it sides square to its flat sole. This extreme precision produced a slightly sharp edge when gripping the upper part of the plane body . A fine hand file and 200, 500, 1000 grit wet / dry sandpaper was used to produce a smooth radius for comfort. Finally a buffing wheel was used with red rouge. The sides and sole were left alone and not sanded or buffed.