Changing the handle of a garden tool is a breeze.
Present the conical end of the handle in front of the opening of the tool socket.
Snap the iron on the handle.
Hold the tool vertically with the iron facing up.
Type two tweaks on the floor.
Solidarize the iron and the handle to prevent dislocation: plant a nail (or screw) through the hole in the socket.
Regularly apply a mixture (half-half) of turpentine and linseed oil on the handle.
Do not leave the tool in the rain and in the sun.
Opt for a long run to avoid stooping and to increase the "radius of action".