It was able to use quietly and finish beautifully finished with 12V without worrying about the location of the connection, but it was hard to stop the main body from turning around for small size or rotation. It is good that the part of the handle is a little broader.
After pushing with a force of about 2 kg and polishing it for about 5 minutes, the shaft got burned. After opening and confirming it, the receiving of the rotating shaft was made of brass with a diameter of about 7 mm, grease evaporated and burned out without enough heat capacity. I removed the fitting and re-greased and fixed it by combining the gear box, but the design was bad. Increase of heat capacity and heat dissipation should be attempted by enlarging the bearing of brass or fitting it to a metal plate such as thick aluminum. Even if it is light, it is a machine that should not be used for pressing purposes.