2 people helps re-spooling.
Loosen the clutch knob. Pull all the old cable off manually. Remove clutch knob assembly. Take the spool off the shaft. Cut the old cable crimp off and remove. Put new cable through boom-end Pulley (don't forget this step), thread new cable through the hole in the spool and re-crimp the end. Re-install spool on the shaft and align line counter gears. Either use the dc motor to spool it back on or use your back-up manual crank handle. Helps having 2 people at the end to provide good resistance on the new spool of cable to wind it on the tightly.
Then re-terminate the end of your new cable.