You want to remove the Eccentric , does it mive when you unscrew the setscrews? might be a corrosion bond issue.

maybe the attemt to loosen that bond, was less than succesful so they sold the thing instead.

.. Or do you just want to replace the Ft BB..

i was only a Short term Burly hire in 90.

ATP made the frames back then rear BB is a snap ring and Loctite holding in oversize cartridge bearings .

I got some Burly frame parts, then, to build my Touring Single..

the rear BB, not the front..