Originally Posted by
WeirdBits
Sorry Stefano I had completely missed your post.
Your changes to the diagram look correct. The modified tone will give a vintage 50’s style control, just make sure the capacitor connects between the lug and the back of the pot (can’t see the back of the pot connection on your diagram). The key element of the 50’s style layout is that the tone link connects to the middle (output) lug of the volume pot.
As stated above, I’d stick with the 500K initially and then decide later. You can always temporarily clip/connect a 500K resistor across the volume pot to see how it would sound if it was 250K.