Here is a tutorial.
https://www.seibertron.com/transform...g-a-hip/38720/
My fix was simpler. I just put a round piece of plastic between the teeth of the ratchet to stop them meshing. The pressure from the springs holds Trypticon upright. I don't like the idea of a sharp pointy spring end eternally scratching the inside of the joint. Likewise for decomposing cardboard.