Aid for building door and/or window recess in wall has base and vertical stem rotating around articulation to form L-shaped section, and rod of variable length used to rotate stem around articulation

摘要

Building aid (1) comprises L-shaped section with base (2) resting on lower side of recess (3), and vertical stem (4) linked to base via articulation (5). Building aid also has means to rotate vertical stem around articulation; those means comprises rod of variable length placed between points (7, 8) fixed on vertical stem and base. Base also comprises spirit level (11).