o the concave face of the door, or 2. When twist is determined by placing the face of the door against a true plane surface. Asimple device to determine and measure twist may be made by placing two cross-memberson a post, one about door height and the other slightly above the floor. The… … -fj WelcomjEL PantaL thn± KjoLoLLoubES C/ioAm. ojuoL JJisiLnjcti / J/La/rLoJujo. cUxyL sjbyUfug