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In this video, I make an adjustable drill bit. I start by using the metal I cut from the M12 bolt. Then I am cutting a Spade Drill Bit. Then I combine the two.
Making Video :
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Did you see this ? Countersink Drill Bit making
Rotatable & Adjustable Wooden Smartphone Stand. You can rotate the phone 360°.
The table of this stand I made is movable. It can be adjusted to any angle you want. Suitable for all kinds of notebooks. I tried it for 17.3" and 13" notebooks and found