Continental Screw Conveyor Page 6 Screw Conveyor Manual "A" "A" "A". PIANO W IRE (STRETCH TIGHT ) JOINT A NGLE CLIP "A" DIMENSION SHOULD BE EQUAL FOR FULL LENGTH OF TROUGH, BOTTOM TO BE SMOOTH THROUGH JOINTS FIGURE 3 5. Place the first screw section in the trough, fitting it onto the end shaft. Install coupling bolts.