I have been working on my UCA and this thread. It is a work in progress. If you get a chance please let me know what you think or if you can add any interesting facts.
You don't need to cobble up a tool to install the bushings in the UCA... Just find a socket that will go over the back side of bushing and put it in a vise, then screw the vice in and let it press the bushing in for you... Use the socket on the back side to keep the other jaw of the vise from contacting the bushing and keeping it from going in... The socket will keep the vise jaws from pressing on the side that you want to move....