I used that tool just yesterday at my bike co-op. A friend wanted me to refurbish the bottom bracket on their '90s era mongoose. The bike itself was okay except that the bb was terribly loose. I got the fixed side off easily enough but the adjustable cup was frozen hard core. It was one of the kind that has the 6 spanner holes and no flats for the wrench. First we got the lock ring off and then we lifted the frame up and put the adjustable cup into the vise and cranked down. Tried braking the cup loose using the frame as leverage and all we did was almost break the vise and lift the able.

So yesterday I got a grade 8 bolt in 9/16ths size with matching grade 8 nut and 3 lock washers and put it into the adjustable cup. Put my half inch socket with short extension into the BB shell and then tightened it down. Used a big ole breaker bar and it ended up breaking the cup free and I was able to save the bike. Never came across one so stuck as that one but all is well now.