If you are really interested in this thing, go to the clothing factory and shoe factory to learn from those mechanics. As long as you are willing to endure hardships, you can become a master without publishing a book for half a year. A relative of mine worked as a part-time mechanic in a shoe factory for three or four thousand months. He resigned a few years ago and now runs a small shop. You can't learn anything at school. How nice it is to learn skills while getting paid in the factory.

Refueling limit:

In order to prevent the sewing machine from malfunction due to excessive oiling, it must be remembered that only 1-2 drops of oil can be added at a time. And must be added to the metal connection parts (such as needle bars); Other parts are not allowed to be added without authorization (it is best to consult the seller's customer service first) to avoid accidents.

Under normal circumstances, if you use it frequently, you can maintain it once a week; On the contrary, it can be maintained once a month. Do not store the machine in the following places, otherwise it may cause damage to the machine, such as rust due to condensation.