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Make a Keycap Puller out of Paperclips - YouTube
Keycap Puller Switch Remover Fixing Keyboard w Cleaning Brush O-Ring - Black, White - 125 x 20 x 4.5mm, 130 x 25 x 6.5mm - Bed Bath & Beyond - 36296110
Amazon.com: Granvela Switch or Keycap Puller,and 2 Brushes, DIY Tool for Mechanical Keyboard : Electronics