i actually have always used the bore out till then idea
never thought of jerry's idea
i think if i was to try that i'd heat the cyl b4 welding it cause welds expand b4 they contract and under expansion it may want to crack the cyl
The weld idea will probably work fine, I use a similer technique to remove valve seats. Running around the top of the seat with a tig torch untel the seat pops out. I agree, pre-heating is probably a good idea, especially on that old iron.