Any tool slippage problems?
What sort of BB is it?
I did get that stubborn 20-year-sleeping square taper out the other day by using the Tacx tool. Eventually.
No signs of movement at all and I was even wondering if it had been crossthreaded when put in.
Then I sprayed in some of this:
https://www.halfords.com/motoring/e...professional-high-performance-penetrant-spray
I must have picked up at
Halfords.
Into the hole on the bottom of the BB shell and saw it, reassuringly, flow straight out if the seattube of the upturned bike.
Then took the seatpost out and sprayed it down the tube towards the BB.
I was amazed to find that the BB then shifted - amazed as I thought that spray was probably pretty innocuous.
May be coincidence but it seemed to do the trick.
Turned out there was no rust at all inside the shell, unlike with one of my old bikes I had left for donkey's years.
By the by - I would always take the BB out even on a new bike - extracted the BB from a bought-new year old bike of mine the other day - there seemed to be way less grease/anti-seize between the BB and its shell compared to what I would use.
If no joy, you can always go to the bike shop.
My local south london bike shop got one out of a bike of mine for a tenner a few years ago.
It's possible that they used something like this:
http://www.chainreactioncycles.com/cyclo-bottom-bracket-removal-tool-set/rp-prod32408
Great mechanic. He also managed to sort the BB shell threads I had managed to screw-up on another of my projects.
Always good if the frame is steel I think.
If so I am confident that some way or another you will sort it.
Please report back if you are successful, using whatever works, including black magic. Reports help/encourage us all.