A friend of mine brought me a Colt 1903 that he found under his fathers bed after his father had passed. The pistol was missing the extractor and extractor spring. I found these and replaced, when test fired the pistol worked fine. I then detail striped it to clean it really well and make sure everything else looked fine. After reassembly, it now will fire, extract, load another round, but the hammer won't stay cocked. If you rack the slide, it will then fire again, but with the same results. I am pretty sure that the sear spring is in contact with the sear and disconnecter. The recoil spring is crooked but worked the action prior to the detail strip. Any ideas on what might be the problem?