THANKS FOR INPUT..I CAN CHANGE HOW MUCH THE SLOT IS OPEN WITH THE PIVOT POINT.MAYBE A LITTLE {SLOT} AT 20 DEG. FLAP,MORE {SLOT} AT 45 TO 50 DEG FLAP. NOW IT STAYS THE SAME,AT ALL SETTINGS. IT GAVE ME A HEADACHE,, I WASTED ABOUT $40.00 IN HINGES,ARMS,WOOD,ECT.. I HOPE IT HELPS PERFORMANCE..