Originally Posted by
Andrew R Stewart
Park made a tool (BBT-8) for the lock and adjusting nut/cone for the earliest cartridge BBs (at the lower price points) they made. The tool is fairly uncommon and Shimano soon moved on from that BB design. I have one but no image to show. When I search for BBT-8 all I got were hits for more the modern BBT-18. Andy
Are you thinking of the BBT-6?
Park Tool BBT-6