- 1). Turn off the trimmer and lay it on the ground for easier access to the spool.
- 2). Hold the spool with one hand while unscrewing the bump knob on the end of the spool. The bump knob is the notched plastic piece that secures the spool to the trimmer. Place the bump knob to the side.
- 3). Pull the spool off of the trimmer. Add replacement string to the spool if needed or dispose of the spool in a waste receptacle if you are replacing it.
- 4). Put the spool back on the trimmer by sliding it onto the trimmer and reattaching the bump knob.
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