I just got another Mcvay B bender back and it is absolutely flawless. The machining is impeccable and precise. The operation is smooth and silent, and incredible accurate. The bender stop stays in tune even after changing strings. Guaranteed not to rust, bust, or gather dust. On top of that, Charlie is an all around great guy. He machines all of his own parts from 7075 T6 aluminum. They use it to make Airplane bodies and wings, etc. It's stronger than 304 stainless steel. It has twice or more sustain than 304 Stainless Steel. It isnt just Aluminum that you buy at Home Depo or Lowe's. I can't stop playing this guitar.