The Ryobi model 28020 trimmer is equipped with a curved shaft that enables the operator to bend less to get a cut. Attached to the end of the shaft is that the string head casing that includes the spool that’s held in place with a spool cap, and also referred to as a spool retainer. When more string is necessary, the spool cap is bumped on the ground, causing string to feed out of the casing in the spool. Refilling the spool together with string can be done without removing the spool or the spool cap in the casing. However, if the spool has become worn and needs replaced, then you’ll want to unscrew the spool cap to insert a new spool. If you are having trouble reattaching the spool cap, then there are a couple things that you can do to reinstall it securely.

Ensure the trimmer’s motor is turned off. Remove the spark plug wire for safety.

Put the trimmer on a level surface, such as a workbench, and that means that you are able to get the trimmer head.

Place the new spool into the string head casing. Rotate it until the arrows on the spool align with the eyelet holes to the casing and the spool chairs completely down into the casing. The spool cap won’t screw onto the casing if the spool isn’t properly seated.

Use one hand to push down the spool into the casing and hold it in position. With the flip side, align the threads to the spool cap together with those on the string head casing. Screw the cap clockwise onto the casing until it’s secure.

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