That Kingsbridge made tool does not work very well because of the space between the two ends. It doesn't get tight enough on the cups and allows for some slippage. I have made a version here that I refer to as a junk yard tool, but it works. Made from two black sockets, two race car lug nuts, and one race car wheel stud. It took bit of welding and clean up grinding but my 20" breaker bar gives me all the leverage needed to break any stuck cup free. Pics:

Both ends of the tool that screw together inside the bottom bracket and outside the stuck cup.

Note that the nuts make a perfect contact so no slippage can occur.
HTH, Smiles, MH