I have to dress up the threads on my wildkart master cylinder which of course are aluminum.
What repair techniques have worked well for you? It’s an M10 thread if I recall correctly.
Dress up threads with a tap.
Replace cap with tapered brass plug.
Replace master cylinder.
I actually had a tapered brass plug in there for a long time, but the head is worn. Problem is I don’t actually know the specs on it. If I can find a replacement I may just go that way and buy multiples.