If you have the springs out, a press is the best way to go. pounding on them may distort them.
Lacking a press Threaded rod or a couple of bolts are best.
use a piece of threaded rod the diameter of the pin (too small and the rod will stretch or break). Put a nut and heavy washer on one end, put it through the bushing and through the spring, 2 very heavy washers or a piece of steel with a hole in it and a nut on the other end. Then cut the rod to length.
Use an impact wrench with a deep well socket to draw it in. When the rod hits the bottom of the socket. go to the nut on the other side and pull it in the rest of the way.
