How do I thread welding wire through the Spoolmatic 30A?

Loosen the thumbscrew, remove the canister cover, then lift the pressure roll arm and open the pressure roll assembly. Thread the wire through the canister inlet guide, along the drive roll groove, and out the contact tube, installing the spool so the wire feeds off the bottom. Close and secure the pressure roll assembly, then reinstall the top cover and canister cover. (Page 10)