DESCRIZIONE
There is described an assembly (1) for carrying out an operation on a net (2), the assembly (1) comprising an operation system (5), wherein that the assembly (1) further comprises: - a first movable unit (3) for being arranged on a first side (21) of the net (2); and - a second movable unit (4) for being arranged on a second side (22) of the net (2), the second movable unit (4) having a relative orientation with regards to the first movable unit (3); wherein the first movable unit (3) and the second movable unit (4) are provided with magnetic elements for holding said movable units (3, 4) at the same position but on opposite sides of the net (2), and for fixing the relative orientation of the movable units (3, 4).