Learn about one of the most important parts of sewing machine repair, lubrication. Oil and grease rarely "ware out". What happens is they get contaminated with lint, dust, moisture, oxygen, etc and the solvents that keep oil and grease in a liquid state, evaporate away. Slowly turning your lubricant into an adhesive. That's why old hinges squeak and hand wheels get hard to turn.
2 окт 2024