The pickups can be made with a staggered pole piece pattern similar to a Fender Stratocaster. The arrangement of the pole piece give the pickup a string balance but also is important to the tonal character of the pickup. By lowering or raising certain poles the pickup will have it’s own inner phasing due to the various lengths of the magnets. Jazzmasters normally have slightly raised magnets that are flush with the top of the pickup cover. Strats have raised poles above the cover and earlier Jaguars have slightly raised poles like the Jazzmasters that later were staggered above the cover. Jazzmasters have the smoothest and warmest sound of all Fender guitars and was one of the nicest guitars built at the time. The biggest problem were the bridge rollers that would vibrate and move around too much especially if your using a lighter gauge of strings. The height adjust screws would unscrew and you’d end up using wax or slide a shim under the threaded bridge roller to keep it from lowering.

The best bridge I found that worked great for the Jazzmaster was a Fender Mustang Guitar bridge. They had solid steel rollers that needed no adjustment and gave a littler thicker sound. The unique tremolo had to be adjusted depending on the gauge of strings you were using. With a little modification and adjustment these are great sounding instruments.