An applicator tool is disclosed for applying a fastener between cooperating surfaces of a dielectric protector placed at least partially over a component of an electrical power transmission system, the applicator tool made at least in part of dielectric material and comprising: a structural frame element; a fastener mount connected to the structural frame element and moveable relative to the structural frame element between a first position and a second position to at least partially define a fastener drive path; and an actuator connected to drive the fastener mount from the first position to the second position to apply in use a fastener, mounted on the fastener mount, through cooperating surfaces positioned on the fastener drive path. A tool is also disclosed for holding together in alignment two mating surfaces with pre-drilled holes and applying a fastener to penetrate the holes and secure the mating surfaces together.