1. Product Overview
This universal spool insert is designed as a reliable replacement accessory for various Stihl Autocut trimmer heads. Manufactured from high-quality ABS material, it offers durability and a long service life, ensuring efficient lawn maintenance and weed clearing.

Figure 1.1: The universal ABS spool insert.
The image displays the black ABS spool insert, a key component for compatible trimmer heads. Its robust design ensures reliable performance for garden tool applications.
2. Specifications
- Material: High-quality ABS
- Weight: Approximately 200g (7.1 oz)
- Color: Black
- MPN (Manufacturer Part Number): 40037133011
- Package Contents: 1 x Spool Insert

Figure 2.1: Detail of the spool insert highlighting its durable ABS material.
This image provides a close-up view of the spool insert, emphasizing its high-quality ABS construction designed for extended service life.
3. Compatibility
This spool insert is designed for compatibility with specific Stihl Autocut trimmer heads. Please verify your trimmer head model against the list below:
- For Stihl Autocut 30-2 Trimmer Heads:
- Compatible with models such as FS120, FS250, FS240 C-E, FS240 RC-E, FS130, FR480 C-F.
- For Stihl Autocut 40-2 Trimmer Heads:
- Compatible with models such as FS310, FS360 C-E, FS400, FS400-K, FS410 C-E, FS450, FS450-K, FS460 C-EM, FS480, FS490 C-EM.
4. Installation and Setup
The spool insert is designed for straightforward replacement of old or damaged parts. Ensure your trimmer is turned off and cooled down before beginning installation.
- Preparation: Power off your lawn mower or trimmer and ensure the engine is cool. Disconnect the spark plug wire for safety.
- Remove Old Spool Insert: Carefully remove the existing spool insert from the trimmer head. Refer to your trimmer's specific manual for detailed instructions on disassembling the trimmer head if necessary.
- Insert New Spool: Align the new Tomotato spool insert with the trimmer head's housing. Gently push and rotate until it seats securely. The design allows for a harmonious fit with the original components.
- Secure: Reassemble any parts of the trimmer head that were removed. Ensure all components are tightly secured before use.

Figure 4.1: Top and bottom view of the spool insert, illustrating its structure for proper alignment.
This image shows the spool insert from a top-down perspective, with a smaller inset showing the bottom. This view is helpful for understanding how the insert aligns and fits into the trimmer head during installation.
5. Operation
Once the spool insert is correctly installed, your trimmer head is ready for operation. This accessory facilitates efficient cutting of lawns and clearing of weeds, contributing to a neat and tidy garden.
- Standard Trimming: Use your lawn mower or trimmer as per its original operating instructions. The new spool insert will function seamlessly with the existing system.
- Weed Clearing: The robust design of the spool insert supports effective clearing of dense weeds and overgrown areas.
- Optimal Performance: For best results, ensure the trimmer line is properly wound and maintained within the spool.

Figure 5.1: Example of a riding lawn mower in operation.
This image shows a person operating a riding lawn mower in a green field, demonstrating the typical use case for which the spool insert is a component.

Figure 5.2: Example of a zero-turn lawn mower in operation.
This image depicts a person using a zero-turn lawn mower to trim grass around a residential area, illustrating another common application for the product.
6. Maintenance
Regular maintenance of your trimmer head and its components, including the spool insert, will ensure optimal performance and longevity.
- Cleaning: After each use, clean the spool insert and the trimmer head to remove grass clippings, dirt, and debris. This prevents buildup that could affect performance.
- Inspection: Periodically inspect the spool insert for any signs of wear, cracks, or damage. Replace the insert if any significant damage is observed to maintain safety and efficiency.
- Storage: Store the trimmer and its accessories in a clean, dry place away from extreme temperatures.

Figure 6.1: Detailed view of the spool insert's construction.
This image provides a close-up of the spool insert's layered design, which should be regularly inspected for wear during maintenance.
7. Troubleshooting
If you encounter issues with your trimmer head after installing the spool insert, consider the following common troubleshooting steps:
- Difficulty in Seating: If the spool insert does not seat properly, ensure there are no obstructions in the trimmer head housing. Verify that you have the correct model of trimmer head compatible with this insert.
- Poor Trimming Performance: Check the trimmer line itself. Ensure it is the correct type and diameter for your trimmer head and that it is properly wound onto the spool.
- Unusual Vibrations: This could indicate improper installation or a damaged spool insert. Re-check the installation steps and inspect the insert for any visible damage.
Note: Due to manual measurement, a slight error of 1-2 cm may occur. Monitor calibration inconsistencies may cause slight color variations in product images compared to the actual item. Always refer to the actual product as the standard.
8. Support
Tomotato is committed to providing high-quality products and an excellent customer experience. If you have any questions, concerns, or are not completely satisfied with your purchase, please do not hesitate to contact us. Our customer service team is ready to assist you.
For further assistance, please visit the Tomotato Store on Amazon.