The Harken DN Adapter is a spring with a swivel mount that attaches the mainsheet block to the tiller post. It uses a H071 spring to prevent the block from hitting the tiller post.
Its attachment point is a shackle and pin. The shackle is a 3/16 in. pin and the pin is a 1/4 in. base pin.
|Pin Size (in)||3/16|
|Pin Size (mm)||5|