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Basically what I want to do is spring load a heavy (relatively) ball into a plastic tube (PVC) against a plate (or end cap) which is guided via small diameter rod running through the center of the ball. The purpose of this is to load the ball and then shoot it from the PVC barrel. What I need is an obstruction at the end of the barrel such that I can push a button, clearing the obstruction, and the ball will shoot out because of the loaded spring. Sounds like it could be a solenoid or an arrangement thereof that serves as the obstruction. I also need to know a simple way to trigger the release of the ball remotely. Thank you for your ideas and suggestions.