To repair this polisher, the fault was first verified when testing it, then it was determined that the field was burned and I proceeded to rewind it by changing new copper magnet wire since it resists more than aluminum wire.
After rewinding the field, the connections were made and it was varnished with electroinsulating varnish.
Finally everything was put together and the new brushes were replaced so that it looked like new.
This entire process was carried out with basic tools such as screwdrivers, hammers, tweezers, brushes and artisan labor.