Upgrade straight one-way manual hand drill

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I have designed the first straight one-way manual hand drill in the world several days ago. It is powerful and handy. After I have used it especially from the fan’s comments, I realized that I can upgrade it a little for better usage.No. 1 Handle partI change the handle part to a screw fixed part. It is easier and convenient to useNo. 2 Add different drill size optionI add the different size of drill which covered the 0.8 to 4.0 mm.No. 3 Modified a little at the stall coupling partEnlarge the space between the small cylinder space. Now it is easier to couple them together between the cage and nuts. Detail information on Youtube:https://youtu.be/1lOdbRMHBew https://youtu.be/1lOdbRMHBew

About the author:
Henry Wang
I am a former scientific researcher who usually worked in University and academic institutes. I am interested in making things using 3D printer. Since this April I worked alone at home. I am now focused on making improvement of household small things better use or invent some useful or dammy stuff which makes life happy. I will continuously upload my stuff here and upload videos on Youtube. Please check my youtube channel and subscribe. I will not fail you. Everything I designed has some unique new ideas which no one ever noticed yet. I will share it with you and wish you also share your experience with us. Make our world a better place. Hope you will have a nice day. subscribe to my channel http://youtube.com/tubeunderdeveloped

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