AV mod made "easy"? - updated, more questions

[FAMICOM_87]

yes the buzzing is usually from the mic. Just cleane the graphite sliders on the joystick 2 PCB and with a very fine sandpaper about 2500 do the metal springy slider thing.
About the further improvements on the mod without cutting the pin 21 or trace from it to the the original transistor .
I read in some threads that you can add a 22mF inductor in series right before the center pin on the video RCA to reducing jail bars even more, but I did not tested this yet, because do not have the inductor with similar parameter