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@ghostface
Cheers @TheShipwright- thanks for the advice. The tubing is 7020 oria, I don't have my calipers to measure but I wonder if it might be a 27.2 seatpost forced into a 27 seattube. I've read conflicting things on the internet about the seat tube internal dims of 7020 tubing. There is no discernible ripple in the seattube but suspect if it was only .2 of a mm this wouldn't be so obvious. My partner already took it to a bike shop who put it in a vice as I don't have access to a vice - and they said it was so tight that it was causing the worksurface to lift. They quoted £100, but as an unknown entity due to not knowing how long it might take. Nightmare
Does PBlaster work on aluminium on aluminium or not? Or would another penetrating oil be better?