An electric lawnmower typically has an "On/Off" switch to activate the motor. To avoid the chance of inadvertently turning on the lawnmower at the wrong time, replace the switch with a toggle switch. The toggle switch requires more effort to move from "On" to "Off" and so provides more safety than the conventional switch does. The procedure is straightforward and requires a few household tools. You will also need to partially disassemble the lawnmower.
Unplug the electric lawnmower's power cord from the AC outlet. Remove the screw on each side of the power switch on the mower's handle, using a Torx screwdriver or, in some instances, a Phillips screwdriver.
Pull the switch out of the compartment in the handle. Loosen the screw on each side of the switch with a Phillips jeweller's screwdriver. Unwind the electric wire from around each screw. Dispose of the switch or put it away to use at a later time.
Loosen the two screws on the bottom of the toggle switch and wind a wire around each screw. If the toggle switch doesn't have screws, heat up a soldering iron. Solder the black wire from the mower to the contact on one side of the switch and the white wire from the mower to the contact on the other side of the switch.
Place the toggle switch in the compartment in the handle and reattach the screws. If the toggle switch won't fit in the compartment, affix it to the handle using strips of duct tape.
Switch the toggle switch to the "Off" position. Plug the mower's power cord back in to the AC outlet.