This was designed around a spring I had laying around. You will have to modify the design for the parts that you have available.
This is also designed for 1/4 material. So, if you intend on using a different material thickness, be sure to modify the joints. Keep in mind that the bottom connection for the spring needs to be able to glide along the 3 “rails” so the spring can do it’s work.
to keep the sharpie in place, I currently am using a rubber band and a binder clip. When I get my 3d printer in, I will be designing a clip to replace it.
Jeff Taylor
Gabriel Hebert