This is the way I have recently been installing them, takes me about 5 minutes. No jigs, no vices, just a few simple tools and I dont even need cuss words any more. Hugh will probably laugh at the method I have come up with.
1. Luger parts: Locate the frame, recoil lever, recoil lever PIN, main spring and main spring GUIDE ROD.
2. TOOLS: Pliers, tapered long pin punch or screw driver shaft that will fit through the guide rod hole, screw driver
http://boards.rennlist.com/upload/MSpring1.jpg