Just joined today so apologies in advance if I screw anything up. I joined just to post a real breakthrough I found in my ongoing battle with dead spots and wolf tones on my Fender P basses,'63/'82/2017. I've studied the physics but saw no mention of the string tree as the culprit. I had tried the Fatfinger-no luck; different string gauges and neck tension- no luck. Today after thinking about the fact that there are two nodes on the headstock,machine head and string tree, I decided to focus on the string tree since it isn't talked about much. I tried a simple experiment based on the simple observation of how engines and motors are vibration damped with hard rubber mounts. I put a hard rubber fender washer (how ironic) under the string tree and it completely eliminated the dead spots at C#(antinode) and D, and the wolf tones on G#and A. The washer is 1/16 thick 7/16 i.d. 1 inch o.d. It is 1/4in. larger diameter than the string tree so you will see 1/8in. of rubber showing. this is vital for it to work,I tried one that was flush with the edge and it only reduced the dead spot about 80%. I dropped the G and D strings two whole steps then pulled them out from under string tree. I cut the washer then pushed it under the tree. The hole is oversized so instead of cutting a notch in the washer I pushed one end under the other at the 12 o'clock position between the strings making it oval which made sure there was enough rubber under each string. I then put the strings under the washer and pushed down on them from below the tree with my thumb as I slowly brought them to pitch,alternating strings every 1/8 turn and pinching the washer from the sides and pushing it toward the nut as I went. When I started testing for dead spots and wolf tones I was thrilled not to find any,only to realize I had forgotten to flatten the EQ on my GK150E which has a ton of it and I had maxed out half of it to hide the dead spot. I crossed my fingers and set everything to 12 o'clock. I slowly walked my fingers up the board, giving it the 5 Mississippi test, it passed! I hope those of you who have been fighting this problem can benefit from this tip, I wouldn't have sold my '63 if I had discovered it a year ago.