Abstract: High performance tractor apparatus having one or more of the following features: selectable tractor feed or friction feed of the web where the tractor and friction feed modes are carried out in non-interfering relationship and with precision line registration in either mode; a latch-down lid which is movable between closed position over the tractor belt and open position for threading of the web with one hand without sacrificing the hold-down force exerted by the latch when the lid is in closed position; hinging of the lid from the frame without any parts other than the frame and lid themselves which can be latched together to provide a unitary assembly; and tensioning of the belt with a shoe which is spring-biased but fixed in position upon assembly of the tractor to apply predetermined tensioning to the belt which may be reestablished from time to time by releasing and then reapplying the clamping force which holds the frame together and fixes the position of the shoe in the frame.