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Can you get at the blockage via the bottom bracket shell? If so you could use a bent coat hanger or something similar to clear the residue...
GreatSince78-
couldnt get the bb out before unfortunately, that is a different problem for a different day.
in the end i got a hammer and a long bit of threaded bar with an edge cut into it and hammered through, it was just residue and dissolved once it had broken up. was fucking hard though, really had to hit it to get through!
all good now. never going to fuck around trying to cut seatposts out ever again.
the thing i found (in case anyone is reading) is,
seal up the entire tube, works faster than having it open.
mix it up really strong, 1 caustic to 2 water otherwise you will be there for ages
used about 750g of caustic
Brameses
marsive dredge here.
went caustic on a super stuck seatpost, few days later and seatpost is gone so all good...the next issue however is I think the residue/byproduct is stuck at the bottom of the seattube?
when i unwrapped the bottle cage mounts there is clear and hard white stuff filling the bolt holes and seattube. from the top i can see greyish mass, any ideas?
frame is noticably heavy so there is a pretty decent amount down there.
attempts to pour water on it to make it react haven't worked..
i think i will try some cola tonight as that may do a nice acid alkali reaction?
edit. just noticed @lae mentions a similar thing being dissolved with amonia so that can be the next option