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Lol, it’s not your fault, basic chemistry (physics?) fail on my part.
For the sake of domestic bliss I think I need to leave it for a bit. Or until I can leave it outdoors for a bit for regular ‘venting’ ha ha.
I’d take it to the Seatpost Man if it wasn’t a ten hour round trip. I’d rather not trust the frame to the tender mercies of couriers…
crossedthread
veloham
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.