a roll used for tensioning a canvas belt used to hold paper against a dryer . the roll includes a main cylindrical body formed of steel . a layer formed of a metal harder than steel is disposed over the outer surface of the main body . the metal layer is formed with a channel around its center so as to define two spaced roll end sections of a common diameter . a fluororesin layer is disposed in the metal layer channel and is shaped so as to have an outer surface of a diameter equal to that of the metal layer end sections .