Thank you for your feedback. We understand how frustrating it is to have a working tool sidelined due to parts availability. For the S-Type trimmer head, the internal spring is part of the spool assembly and is not sold separately, which is why replacing the full spool or head is typically required when components are lost. As a troubleshooting step, we recommend confirming the exact model of your trimmer and checking compatibility with any updated or alternate spool assemblies, as some newer replacements may be cross-compatible even if the original part is out of stock. It may also help to inspect the trimmer head to ensure no debris or line fragments are preventing proper reassembly if you still have the original components. For guidance on proper spool installation and handling (which can help prevent parts from dislodging during changes), we recommend reviewing a Greenworks instructional video that walks through line loading and head assembly. Due to ongoing inventory fluctuations, availability can vary, but our success team can assist in checking restock timelines or identifying a compatible alternative, please reach out via chat on www.greenworkstools.ca or by phone on 1-888-909-6757 with your model number so we can help get you back up and running as quickly as possible.