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Yep, I've fully mullered my post over the weekend. Not budging. It's in too deep as @TheShipwright suggested.
Gonna have to get caustic on it. Do people think it might help remove the paint...
I'm hoping the fact I've put all these cut marks into the alloy, and prised it away from the top of seattube might help the caustic get in and around the post, allowing me to pull it out at somepoint beofre I've eaten all the alu out. Could be a long process. Hope I (and my children) can still see at the end of it.
The altered drill bit is another option, but I only have a relatively cheap handrill, which I just can't see working.
i'm having real problems chopping a thomson post out at the moment.
it's about 20cm into the frame... i'm working away with a saw but it's really difficult to get a uniform cut all the way down the length of the post.
i'd deffo go the caustic route if i wasn't bothered about the paint. i might try for a local metalworkers and see if they can ream the fucker out for me.