As I said in an earlier post, I ordered up a set of Ultralite heads for my USACustom jazz bass neck to see if it would do more than the Fatfinger. So here are the results: Inconclusive With the original Schaller BML heads it had a wicked deadspot at C# on G string and the 12th fret harmonic (NOT the fretted note) of the D string. The Fatfinger reduced but not eliminated both. With the Hipshots the deadspot moved up to D#(Eb if you prefer) and reduced it by about 50%, the harmonic over the D string was also improved but not totally. Adding the Fatfinger to the Hipshots moved the deadspot back down to C# and left the harmonic over the D the same. They DO make the neck noticably lighter. But leave all the holes from the bigger heads exposed All in all the results are not worth $100 in my book but I hadda try - So - lighter heads will definitely effect your deadspot issue - unpredictably Next I will swap necks betweek my PJ and the Jazz to see if the problems follow to the other body!