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 part
I change the handle part to a screw fixed part. It is easier and convenient to use
No. 2 Add different drill size option
I add the different size of drill which covered the 0.8 to 4.0 mm.
No. 3 Modified a little at the stall coupling part
Enlarge the space between the small cylinder space. Now it is easier to couple them together between the cage and nuts.
Detail information on Youtube：