This corrosion tore one of my brand new o-rings (Julie sent me) when I was putting the jet back in on top of the needle😭. Not a complete tear…shaved off maybe 25% of the tiny oring. Now I don’t know whether I should leave it there or put an old O-ring on it, only one of the 4 didnt crumble when I took it off.
After that one tore, I used a very fine rat tail file to smooth up the inner edge circumference of all the other towers on the remaining carbs and had no further problems