Rather than a spring, a coil gun would work with any conductive material quite effectively. I imagine that the difficulty is repeatedly changing orbits - this w

Rather than a spring, a coil gun would work with any conductive material quite effectively. I imagine that the difficulty is repeatedly changing orbits - this will probably require more propellant than can be derived from junk. I was wondering if SpaceX couldn't use its second stages to grab some junk while it is deorbiting. That would be some seriously good publicity.