the long pin, l shaped thing, spring i guess, and the rudder, the catch, do go above a hammer, it it called the trigger catch. u can choose to leave it in or out but i would perfer in. to put it back in u put the pin in a hole above the hammer. then u put the spring on the pin. then the catch part u put in on but make sure all of the spring is on the right,top, side of the catch. when its all in push the catch as far upward as it can go and let the hammer go as far forward as u can and let the catch go. hope this will help
http://www.crosman.com/2004/pdf/manuals/crosman/1077/C1077-EVP2.pdf