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@tbc
So, today's progress:
Fitted cranks, taped bars (badly, using second-hand tape), went for a quick ride sans seatbost bolt hoping that the soaking in Coke overnight had been enough to kill the corrosion. So this is basically how it will look when it's done:
But the seatpost didn't move. Time is of the essence, I'm back in London on Friday and would like a fully working bike by then. So I went straight to the most drastic option:
Seemed quite fitting, as the guy I bought my other Donohue-built bike off said he'd had to to the same with that to remove a stuck seatpost. I thought that sitting with a hacksaw blade running it up and down the inside of the seatpost would be straightforward, but monotonous, but it turns out that is beyond me. I just couldn't get a level cut all the way down the inside of the post, and my attempts at squeezing it together and twisting it have gnarled it up a bit:
Also tried this, based on something I read on a Fatbike blog:
All to no avail so far, it's currently sat upside down, sans BB and cranks again, with Mr Muscle drain unblocker gel oozing through the cork that's supposed to be blocking it, somehow squeezing between the seatpost and seattube, and through the holes I've sawed in the side.
Fingers crossed for tomorrow...