I have done many 1911's before and have never had this problem. I was asked by a close friend to put a new trigger in his springfield M1911 a-1 i though no problem. After installing the trigger i started reasembly. After putting everything back I went to cock the hammer and realized that it would not stay cocked. I have tried everything that i can think of to fix this problem but i am at a loss any help would be great.