In response to requests from Ric owners for a Fender version, we came up with this. Like the Zero Mod for Ric, it requires NO new holes and uses the existing pickguard screw holes to give you a thumb rest with solid feel and great range of position!.
The answer for many versions including the Geddy Lee, Mexican, and American Jazz. Just check the pic below to see if your pickguard screw pattern is compatible with the Zero-Mod Jazz
Haven't Decided Yet
By Clark Johnson from on 3/22/2017
To start off, it was incredibly easy to install, so that is a positive note. And yes, it functions nicely as a thumb rest, particularly above the strings closer to the neck. Nice to have.
However, the flange around the upper screw hole sticks up and can interfere with hand placement. And, the edge of the thumb rest next to the strings is very sharp, and I can run into it when using my fingers aggressively. I'll try to sand that down a bit to soften the impact. Lastly, and this is a playing issue only, the placement of the thumb rest on the bass tends to favor the strings near the neck, giving a softer tone. I find that sometimes I have to deliberately remind myself to play nearer the bridge to get a sharper tone.
So, still getting used to this, and haven't decided to keep it on or not. I'll recommend it anyway because it is such a great concept.