An electromagnetic actuator includes two electromagnets arranged opposite one another, an armature movable back and forth between the electromagnets against the force of two mutually counteracting springs, and an adjusting device for adjusting the armature rest position. The method includes identifying a fault at a local node, mapping a fault indication bit into a carrier packet, and transmitting the fault indication over a network. A left riveting cylinder and a right riveting cylinder are provided on two opposite sides of the worktable corresponding to the positioning mechanism, respectively, a left riveting die being provided at an end of the piston rod of the left riveting cylinder, a right riveting die being provided at an end of the piston rod of the right riveting cylinder. The first and second integral resilient legs each include a groove which increases the resiliency of the leg. A voted electronic ballot is transmitted from the second computer, via the transaction mediator, to the computer database that resides on the transaction repository server.