Genuine Spring Heavy B3103804000 for Juki MO-814 Sewing Machine

This is a genuine Juki heavy spring (Part No. B3103804000) designed for the Juki MO-814 overlock sewing machine. It is an original OEM replacement part used in the machine’s tension or internal mechanism to provide controlled pressure and smooth operation during sewing.

Manufactured to Juki factory standards, this durable heavy-duty spring ensures consistent performance, stable tension support, and long service life. It is ideal for replacing a worn or damaged spring to maintain proper machine function, reduce vibration, and ensure high-quality stitching results.