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The DN Adapter is a spring with a swivel mount that attaches the mainsheet block to the tiller post. It uses a 071 spring to prevent the block from hitting the tiller post. The attachment point is a shackle and pin. The shackle is a 3/16" pin and the pin is a 1/4" base pin.
Shackle pin Ø (in)3/16 in / 5mm