How to install a G&G cranestock?

My crane stock fell off while I was trying to tighten the lock nut and 6 pieces dropped. How do I install it back on my G4-A3?

The parts that fell off are...

Spring
Crane stock body to go on back of gun
Lever to extend
a lock nut
1 and 1/2 inch screw
1/4 length screw

Any help regarding how to put my crane stock back on my G4-A3 would be greatly appreciated.
http://www.airsoftgi.com/product_info.php?products_id=5120

If I could have a mod lock this because i fiddled around with it and fixed my crane stock.

edit: They way i fixed my crane stock was that i put the spring down the hole in the top(MAKE SURE IT GOES DOWN THE HOLE INSIDE!) Then i put the screw in the same way(not the small screw) i then had the thread part stick out at the bottom and put on the lever to extend it on top of it. then i pushed the lever down and screwed the lock nut onto the threads. then you slide the crane stock body through the wires and onto the back of the gun and VOILA!

you successfully fixed/installed your G&G crane stock. hope this helps anybody else with a G&G crane stock problem.