It is relatively easy to get small pieces of dust to stick together, because of electrostatic forces and van der Waals forces (tiny forces arising from the polarity of molecules). (sciencemag.org)
A female spider can pick up the signal with parallel slits on its legs, known as the lyriform organ, which change shape under tiny forces. (sciencemag.org)
To stay in that exact spot, the craft will use a field emission electric propulsion engine, which ejects ions of liquid metal cesium to exert a miniscule thrust to counter tiny forces on the craft, such as the sunlight itself. (discovermagazine.com)