I have made working miniature power tools like Power drill, angle grinder, circular saw, air blower...and more with the name of "SAZOH miniature power tools"Here are the video links of my working power drill model (Please subscribe my youtube channel for more videos)https://www.youtube.com/watch?v=TQumYgobBhY
https://www.youtube.com/watch?v=JCyQfGLsajI