BASIC OPERATIONS-continued -;:::::==:::;= ~== :::::::;6 Loosen the joint- knob ®l .To loosen the joint knob, turn it coun-terclockwise while holding the jOintplate @.9. Lock the joint.- Align the flash head positioningindex @ with the " normal " positionmark on the flash head positioningscale , then turn the joint knob clock-wise until the joint is locked in posi-tion .• See page 15 for in fo rm at io n about removingthe joint.81 Properly position the- joint plate.Turn the joint knob so the flat sidesof the jOint plate are parallel withthe flat edges of the joint.10 Loosen the joint-Iever @.Turn the joint lever counterclock-wise as far as it wil l go to loosen it.8 Insert the joint plate- Into the joint collar CD .While holding the base of the jointknob against the joint, slide the jointplate into the joint collar until it isfully seated. '• Whe n inserting the joint plate into the jointcolla r, be sure the fla t edges of the joint plateremain parallel to the flat edges of the joint.11 Insert the arm @ into- the joint.Insert the arm positioning screw @Jinto the slot in the joint. The arm canbe inserted from either side of thejoint. The normal position is shownin the photo .