But honestly it looks a lot like a heavier duty version of the control arm tools that Mancini sells. And having used those, using the tap and a press is the way to go
The mancini tool needs the "fluted" end milled down thinner to get under the end of the shell, then it works great. I found that out of the box the working end was about twice as thick as the gap for it to sit in at the bottom of the bore.