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Use a bench vise to hold the cup and a pair of Allen keys to get some torque on the insert? The usual suggestions RE penetrative oils etc will help.
Alternatively, find a new insert!
hamrack
Hi tandem people, I posted my query with no luck in "any questions answered".
I'm under the impression that, although the bb is fitted to a tandem eccentric shell, it's not tandem specific... But maybe I'm wrong.
"There's a possibly stuck BB (I didn't abuse it so far before understanding what it was) in the eccentric part of a current project tandem...
I managed to remove (wasn't easy, must have been fitted dry many years ago) the 2 lockrings (no reverse thread on non drive side) but I can not tell how it's inserted. It seems like there's no thread inside, like if it was a push fit (maybe like some Mavic BBs).
What is it and how do I take it out please?
Thanks!"