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The narrow fork of the hinge goes in the slot in the mast step, secure with a pin through the holes. The wider fork goes around the tang on the mast base, secure with a pin through the LOWER set of holes. Place a teflon chip in the mast step cup. Stand on the tramp near the stern and raise the mast. The bottom of the mast may need to be shoved back and down to seat in the cup. Secure the forestay to the bridle. Many sailors use a double 10-hole chainplate at the bridle to make it a little easier.

Hope this helps.