Although could matter run like water, ie. you pull out the plug and matter runs down the hole and the difference beetween gravitational fields in the two universes could decide the direction of travel.
Maybie?
Ideas?
Here it is, its probably an old one but as I am not a fully fledged scientist I don't know if it is. It relys on parallel universes. So what if the black hole sits over a valve beetween the sheets of these universes sucking in matter and compressing it through the valve into the parallel...