By far the best is a chain swaging tool like MB's. Second choice is a small ballpeen hammer and a body dolly to "back up" the pins -- hold the dolly firmly agains the back side of the chain and peen the ends of the pins over against the plate. Not as neat as the tool, but as long as the end of the pin is significantly larger than the hole in the plate, it's on to stay. The pins are relatively soft, so you won't have to really pound on it. Have a care to hit only the end of the pins, and don't let the dolly come out of contact with the back side as you hammer, or you will likely break the gear you will perforce be working over! Any piece of solid steel will work as a dolly -- the body ones are nice, though.
We had to actually press the plate onto the pins, it fits pretty tight.
1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!