How do I remove the coil ST4000 Black & Decker trimmer (mill)?

The ST4000 Black & Decker trimmer is not as easy as I thought, It would replace the coil, there are no arrows or marks, and I tried to escape a hard time. Any & any help would be appreciated.

You can their site and download a complete handbook for IT.

Black and Decker FS105 WSMiter Saw Work Stand Black and Decker FS105 WSMiter Saw Work Stand
$149.00

Black & Decker CPI20XB Power to Go Power Supply NEW Black & Decker CPI20XB Power to Go Power Supply NEW
$19.99

Black & Decker BBC2CB Vehicle to Vehicle Battery Boost Black & Decker BBC2CB Vehicle to Vehicle Battery Boost
$14.99

VPX 3101 black decker AC/USB power source NIP FREE SHIP VPX 3101 black decker AC/USB power source NIP FREE SHIP
$8.75

L@@K Black & Decker Jig Saw #7504 (2.1 Amps / SPM 3200) L@@K Black & Decker Jig Saw #7504 (2.1 Amps / SPM 3200)
$6.99


Black & Decker PHV1800CB 18-Volt Pivoting-Nose Cordless Energy-Star Handheld Vacuum Cleaner Black & Decker PHV1800CB 18-Volt Pivoting-Nose Cordless Energy-Star Handheld Vacuum Cleaner
$50.00

18V, Cordless, Pivot Head Vaccum, Extentable Nozzle & Multi Position Pivot Head Gets Into Tight Places, 3 Stage Filter System & Cyclonic Action Make This The Ultimate Cordless Vac, Energy Star Compliant....
Black & Decker TRO480BS Toast-R-Oven 4-Slice Toaster Oven Black & Decker TRO480BS Toast-R-Oven 4-Slice Toaster Oven
$26.98

Large-capacity 1200-watt 4-slice toaster ovenBake, broil, bagel, toast, and keep-warm functionsAdjustable temperature up to 450 degrees F30-minute timer; slide-out crumb tray; baking pan includedMeasures approximately 12-2/5 by 18-8/9 by 15 inches...
Black & Decker NST2018 Grass Hog 12-Inch 18-Volt Cordless Electric String Trimmer with 2 Batteries Black & Decker NST2018 Grass Hog 12-Inch 18-Volt Cordless Electric String Trimmer with 2 Batteries
$97.02

...