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@Matt_B
Nhatt.. don't give up all hope. a friend of mine had a stuck fixed cup in a steel colnago. Broke my vice trying to get it out, in the end he took it to a blacksmiths who welded on a bar.. came out on the second attempt.
I also bought a frame the other week.. 3 different people tried to get the un54 out. Heat, wd40, plus gas, vice, extensions.. you name it. So i took it up to BikeFix with the idea of using OxyAcetaline on it.. tried the big vice first, bolted a bb remover to it. After a crack and a squeal it came out, without having to use any major heat.
This was a frame i had more or less given up on. It now rides like a dream.. after a face and chase.