Inner Bobbin Case (uchigama): Where the bobbin is inserted. For home sewing machines with a horizontal bobbin case, damage to the inner bobbin case can be a cause of sewing problems. If you experience any of the following symptoms, please check the inner bobbin case for scratches: * Thread tangling and inability to sew. * Incorrect thread tension. * Skipped stitches. * Scratching sounds from around the bobbin case. 【Compatible Models】 ● F Series HZL-FQ65, HZL-FQ45, HZL-F3000, HZL-VS200G HZL-VS200P, HZL-VS200S, HZL-VS200V HZL-F600JP, HZL-F400JP, HZL-F300JP ● X Series HZL-NX7 HZL-EX7, HZL-DX5, HZL-NC1134N, HZL-OX1, HZL-CX3 ● G Series HZL-X3000, HZL-V2000, HZL-G110M-B, HZL-G100B, HZL-G200 Product Code: 40079614