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I'm very sorry to hear about this.
No one considered the implication of the sealed seat tube - with a conventional frame there is no pressure build up because the gas escapes through the bottom bracket shell.
It's disappointing that the pin is still stuck, but it's clear that the method is working - given enough vinegar and a lot of patience (mainly from other family members !) that pin will either come out or dissolve completely. If you do carry on you will need to relieve the pressure from time to time.
I can only offer my apologies for the mess.
clubman
@crossedthread
Room now stinks as well.
Gah, what an idiot.
Luckily it happened while I’m at home.
Coming back to a worse mess - because it would have failed, likely soon - as the frame launched itself like a firework around the house. Doesn’t bear thinking about.