Pull the main spring housing back off, by drifting the pin in the bottom out, left to right. Bring the hammer back to full cock. Put the thumb safety on to the half on half off point and pull it straight out. Remove the grip safety. Raise the hammer strut up out of the way, so that you can see the sear and disconector. Take the sear spring and place it in the cut in the frame and place it against the sear and disconector. Gently slide the mainspring housing partway back onto the gun, so that it holds the sear spring in place. Put the grip safety back on and slide the thumb safety back into place. Push the mainspring housing back into place and put the pin in. Go slowly and do not force anything. Your gun should now work properly. Go to a gun show and buy yourself a good book, with lots of pictures on 1911's. That will teach you a lot. Good luck and good shooting. Be safe...
7th
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