Another first from Callaham, this direct replacement ABR-1 bridge is milled one piece at a time on a CNC from a single billett of cold rolled steel and then hand polished and shaped to this beautifuly tapered finish with perfect sharp edges and then copper free nickel plated.
All other Tune-O-Matic style bridges and we mean ALL, are zinc die cast and always have been because it was the only way to produce complex shapes back in the day, no CNC's in the 50's. What no one realized was that zinc is a terrible material for use in a guitar bridge, no other bridge is made from zinc it is always steel or brass, zinc is virtually incapable of promoting harmonic overtones relying on the power of the pickups to do all the work.
With the Callaham ABR-1 bridge you will notice a much smoother transfer from wound to plain stings, a clearer more defined tone with the lows clearer and punchier and the highs less spiky. You will notice and improvement in the way a note blooms, sustains and rings, it is just much more musical.
You can either remove the studs that you have in place which are more than likely steeel, though best to let a luthier do that, or leave them in place and replace the bridge and the thumb wheels. This way you will get 95% of the benefit without 95% of the headache.
Callaham ABR-1 Tune-O-Matic Bridge, Vintage Studs on YouTube