Hello all, I am 100% untrained in even reading about spring making let alone making them. There's a project I want to complete though and I need to make some props involving them. I say these conical springs would be roughly the diameter of a basketball to start with (9.55") and cone to a point for a very basic explanation. The image I attached is the best form to show what I'm trying to accomplish. I'm looking to make some costume props (4 exactly) resembling arms that would be attached to the person's back, be held down, and spring out when released and return when not in use. Ultimately the four "arms" would point to the front like in the image as well though not looking for springs to do all of that on their own. I will make some sort of wire attachment so the wearer can guide them. I'm posting here in hopes of getting a direction and not necessarily a complete guide on how to accomplish this though more information the better. From what I've been told so far this seems like a very near impossible tasks (this came from a veteran Mechanical Engineer so I'm guessing I'm above my head here) but I still have interest in making it work. If anyone can give some pointers or simply a direction for me to go in order to figure this out, it would be much appreciated.