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BEYOND THIS ANGLE THE SHACKLE FLIPS . NORMAL ANGLE . ‘x’. SHACKLE. NORMAL POSITION. BEYOND THIS ANGLE IT FLIPS. ‘x-y’. UPPER POSITION. NORMAL POSITION. SAFE ANGLE. BEYOND THIS ANGLE IT FLIPS. NORMAL POSITION. LOWER POSITION. BEYOND THE SAFETY ANGLE AND THE SHACKLE FLIPPED INWARD.
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BEYOND THIS ANGLE THE SHACKLE FLIPS NORMAL ANGLE ‘x’ SHACKLE NORMAL POSITION
BEYOND THIS ANGLE IT FLIPS ‘x-y’ UPPER POSITION NORMAL POSITION
SAFE ANGLE BEYOND THIS ANGLE IT FLIPS NORMAL POSITION LOWER POSITION