Issue link: https://docs.hic.us/i/852277
96 Chapter 8 Appendix 8 Rotary hook race 1. Apply a few drops of oil to the rotary hook race. All needle bars and felt inside needle bar case 1. From the gaps in the take-up lever located in the upper part of needle bar case, apply a few drops of oil to the upper part of the needle bar. Apply oil to all needle bars. 2. Use a flat head screwdriver (2.5 × 75) to remove the screws at right and left from the bottom cover, and remove the bottom cover. 3. Apply a few drops of oil to the felt in the needle bar case. 4. Once the lubrication is completed, replace the bottom cover and fasten the screws at right and left using a flat head screwdriver (2.5 × 75). Caution Be careful not to pinch any of the wires inside the needle bar case when installing the bottom cover.