Hey! I'm trying to find a more cost efficient alternative to a spring for a design that i'm working on. Basically, i'm designing a tile that you step on and drops about an inch and then comes back up when you step off. I have been researching and trying to find springs to use, but my cost is coming up to $50 to $80! I need this mechanism to cost under $10. There would have to be 4 supports for the tile (ex. 4 springs) and it would have to be able to take a total maximum load of 500 pounds. The mechanism would have to lower one inch when 200 pounds are placed on it. What is a mechanism that i can use that would be stable and under $10?