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If the retainer knob on your straight shaft Homelite or Ryobi trimmer is cracked or lost, this is the fix.
Two genuine OEM knobs, part number 55-816.

Bright red so they're easy to spot.

Made in the USA.

Just screw it on to hold your trimmer spool in place.

Cheap, simple, and way better than rigging something up.

Keep a spare in your toolbox.

4.5 out of 5