Restart the rebuild

Started to smooth everything out. Using a stone for the most part(so far).
There is a pretty significant ridge/lip(narrower), right below valve seat. My fingernail catches when moving inward like the exhaust would. This is where the small stone comes in handy! Fn nerve wracking and tedious tho. The 1st pic with red straw shows what I'm talking about(untouched).
2nd pic shows area partially smoothed with small stone.

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