This is the standard cure for offset bridge rattle and wandering saddles, but it is not a bolt-on. The bridge sits on Mastery's own thimbles, so the ones pressed into your guitar have to come out and be replaced, and on Mexican-built offsets the holes sometimes need opening slightly before the new ones seat. Buy the version that comes with thimbles and budget for a tech to fit them.
Why we say this
Mastery's own fitment guide specifies the M1-KIT for this guitar, not the bare M1 bridge, because the bridge seats on Mastery's own vintage-spec MT thimbles rather than the factory ones. The bare M1 is only correct for American-made Fender offsets built before 2013. Mastery further list Mexican-built Jazzmasters and Jaguars as a case where the factory thimbles have a smaller inside diameter and sometimes a smaller outside diameter as well, in which case they advise opening the body holes with a 3/8 inch bit run in reverse before the new thimbles will seat, and recommend a luthier for the job. That makes this a body-side fitting job rather than a post-for-post swap, which is why it is not classed as a drop-in. Mounting post spacing itself is not the issue and is unaffected by any string-spacing question on this guitar. Verified against masterybridge.com, September 2026.
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