Yes, garter springs can be custom-made. Garter springs are a type of extension spring that is coiled into a circle, often used to provide a constant radial force. Customization of garter springs is possible to meet specific application requirements, including variations in size, material, wire diameter, coil diameter, and tension. 
Manufacturers can tailor garter springs to fit unique specifications by adjusting the following parameters:
1. **Material**: Common materials include stainless steel, carbon steel, and other alloys, chosen based on factors like corrosion resistance, strength, and environmental conditions.
2. **Wire Diameter**: The thickness of the wire can be customized to alter the spring's strength and flexibility.
3. **Coil Diameter**: The diameter of the coils can be adjusted to fit specific spaces or to provide the desired tension.
4. **Number of Coils**: The number of coils can be modified to change the spring's elasticity and load capacity.
5. **End Configurations**: Custom end configurations can be designed to suit particular attachment methods or to integrate seamlessly with other components.
6. **Load and Deflection Requirements**: Custom springs can be designed to meet specific load and deflection requirements, ensuring they perform optimally in their intended application.
Custom garter springs are used in various industries, including automotive, aerospace, medical devices, and consumer products, where precise specifications are crucial for performance and reliability. Working with a manufacturer that specializes in custom spring design and production can ensure that the garter springs meet the exact needs of the application.