In my dictionary:
swage (n. v.) 1. a tool for bending cold metal to a required shape. 2. a tool, die, or stamp for giving a particular shape to metal on an anvil, in a stamping press, etc. 3. swage block. 4. to bend or shape by means of a swage [ME, t. OF: m. souage]
swagged on the other hand means: to cause to sway, sink or sage.
So the tool for swag> In writing some text for assembly instructions, which would be the proper