A modular strapping head assembly includes a body, a weld head assembly, a drive motor configured to control the weld head assembly to grip and seal strapping material, a transformer assembly, and a single power interface configured to direct power from a source to the drive motor and the transformer assembly. In one embodiment, a local clock of a gateway device is periodically synchronized with a remote time service facility over an external network. The sliding guide rails are used to put downward pressure on a workpiece while guiding a router across the workpiece during the dadoing process. In the second portion, the magnetic quadrupole field is set stronger than the electric quadrupole field.