I have a question regarding a prop I'm making myself that involves a spring-type mechanism. The prop is a Steampunk spring-action lightsaber, approximately 2.5-3 feet in length, made from acrylic and covered in copper tape for aesthetic. The "spring" portion is just a series of rubber bands which pulls forward the plastic blade in a telescoping fashion with the removal of a stopping clip (I've mimicked the function of the toy lightsabers that spring out at the press of a button, so if it's still hard to understand what it is, think of that, but homemade). The whole mechanism is handheld, stowable, and kept clipped at the belt when not in use.
Since spring-powered mechanisms like this aren't mentioned in the Prop Acceptability Checklist, I wanted to make sure it would be OK before I finish making it.