Something I proposed and sent to the experts many years ago; back then I was thinking of opposing ion rather than plasma engines of course. Plasma wasn't a thin

Something I proposed and sent to the experts many years ago; back then I was thinking of opposing ion rather than plasma engines of course. Plasma wasn't a thing, then. A point they've dropped from my proposal is that used on a spinning target you can de-spin it. (Even if it's spinning along more than one axis in fact, with intermittent thrust.) This is especially useful to capture, move, and then utilize asteriods, say. Or as a way to stabilize the target (such as an asteroid), so that both engines can be joined to the target to move it. See "jacknife" below. Very useful for cleaning debris from orbit. A few years ago, I realized that what you want is a "jackknife" implementation with a hinge between the two engines that allows you to use both thrusters to move to and from the objects you want to move. Since no-one had picked up the original idea (except as modified to use gravity vs one engine), I made no attempt to publicize that refinement to the idea.