Installed a small switch / mod into my my 2010 Fender American Standard Stratocaster (which already has been upgraded some time ago with locking tuners and a prewired Fender HSS pickguard with Shawbucker and Noiseless pickups).
The switch only affects the Shawbucker and connects the blue 1nF ceramic capacitor (parallel, to ground). The effect is pretty much the same as what the res peak switch of the Seymour Duncan Pickup Booster does in setting 1 (820pF cap on the new and 1nF on the older model): Shifting the resonance peak of the pickup down.
I like the Shawbucker for what it does. It is a bright, low output and very dynamic pickup, that goes well with the single coils. But in some cases it can be a bit too much bite and spank and I would like to have a "classic sounding" humbucker. Tested a few caps and 1nF works best for me. It sounds subtle enough, but much more like a well balanced classic humbucker now. In high gain the effect seems subtle first, but it makes a huge difference for me. Without noise gate you can clearly hear how some (disturbing) high frequencies are cut out. I still get a cutting, but more pleasing metal tone without strange piercing highs. With 2nF and higher cap values it gets too much of a cocked wah tone (similar to SD Pickup Booster in setting 2).
I couldn't get the same results with tone control (feels like loosing some attack...) or with EQ (playing around with 5khz, 2.5khz...). And I didn't want to get rid of the unique sounding Shawbucker either. So it was a pretty simple cheap mod that turned out great and made this already versatile guitar even more flexible. Also dropped in an Orange Drop cap on the tone control, simply because I had one lying around unused...