Abstract: The invention relates to a soil working device, comprising a substantially cylindrical soil working member, which is mounted between two main supporting arms for rotation about a substantially horizontal axis and is axially composed of a number of sections which are mutually connected and connected with two shaft end sections journalled in said main supporting arms respectively through couplings of the universal type, the coupling between each two sections being supported by an auxiliary supporting arm which extends into the travelling direction and pivotally engages a connecting bar extending between said main supporting arms parallel to and in front of said soil working member.

Abstract: Starting from a mark (G) provided on a wall of the room, plugs are cut from a plastic rod (11), which is adjustable within a tube (1) of the tool, which is supported through legs (3; 23) by the underground . The cutting takes place at the location of a quantity of adhesive provided on the ground, so that the plug adheres to the ground. The upper surfaces of the plugs then indicate the correct height of the floor of flowing mortar to be provided. The correct plug height is obtained at each location when a laser receiver (9; 35) connected to the tube is coincident with a stationary positioned laser beam (20).