Where are you based - if it's what I think it is and sizewise compatible with the latest (smaller) Ultegra ones, I do have the metal tool for installing, in N8
This is what I have: Shimano TL-FC37 HollowTech II BBR60 bottom bracket socket
There's an even smaller Ultegra now for BB9000 et al. BBR60 is the middle of the three sizes. The 1608 tool above looks like it's for the middle size too.
Where are you based - if it's what I think it is and sizewise compatible with the latest (smaller) Ultegra ones, I do have the metal tool for installing, in N8
This is what I have: Shimano TL-FC37 HollowTech II BBR60 bottom bracket socket