GreenWorks Elite ST-140-AT Guide D'utilisation page 21

OPERATION
10. Insert the ends of the lines through the line exit holes in the sides of the cover.
11. Reinstall the spool and cover onto the trimmer head. Push until cover snaps into place.
REPLACINT THE BUMP KNOB (See Figure 10.)
1. Remove the battery pack.
2. Press the tabs simultaneously on the side of the trimmer head and remove cover and spool.
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Fig.9.6
Fig.9.7
Fig.10.1