I also added nuts with lock-washers to make sure the threads in soft aluminum would be more solid. Looks very professional great quality sound too! This wireless charger was just the answer that I was looking for. I highly recommend this item and the level of attentiveness from the vendor. I have achilles tendonitis, plantar fasciitis, and flat feet. He only wished the bottom of slipper had a grip. Es la mejor batería que he visto de lejos, ni Sony, ni Bose, ni Sennheiser pueden hacerle frente. Zero sound output. I teach group fitness classes (online only right now), this is my third mic like this, first one exactly like this. It has freed up a lot of room.