Domino Zipper

This is a zipper to either get a Domino line up or down a certain distance. The file contains two prints. One has a cavity if you want to fill in some weights and one doesnt have that cavity. Going up:You tape or screw the zipper on the top side, attach a string to the hole and tape 3 dominoes to the bottom of the string. The 3 dominos are placed either at the end of some stairs or any other contraption that drops them. A line is placed on the top part of the zipper. When the weight at the bottom is dropped it rotates the zipper, making the line fall. Going down:Only the frame of the zipper is taped at the top with the string going through it and connecting to the weight which is placed here:At the bottom a full zipper is placed with the string going through the bottom loop:When the weight at the top falls down it pulls on the string, activating the zipper at the bottom.