aterstones are renowned for cutting fast, but many require regular maintenance to stay flat. This is no small thing—a flat surface is essential for producing a
Smartphone Amplifier
Plastic smartphone amplifiers can be had for about $15 a piece, but expect to fork out $100 or even more for a fancy handcrafted wooden one. They give a louder and richer sound than the phones by themselves. In a nutshell, they are just a box with a
