Push-down button with a ballpoint pen spring
Description
This Is A Push-Down Button Consisted Of Three Independent Parts (Inner, Upper Outer And Lower Outer) And A Typical Ballpoint Pen'S Spring. When Parts Are Combined, Button Can Easily Moves And You Can Push It Down. It Will Revenue Back Into Initial Place As Soon As Released. Https://Www.Youtube.Com/Watch?V=W45Jbwirs3K
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