I bent my CZ52's trigger return spring back in November or so. So in December I ordered a new one from Buymilsurp, and was sent the wrong part because he was out of the one I needed. I did lots of searching and bought one off a individual on Gunboards last week. I just received it today. I get to disassembling it and looking up how to correctly put it back together. I did everything by the book, I get it back together short of the slide and grips. I cocked the hammer, flipped the safety off, and pulled the trigger. It did everything it was supposed to, I tried a second time, success. I try a third and final time, and the trigger connector bar disengages. I loosen the retaining nut slightly, push it back where it belonged, and tried again, it disengages again. I go back through and recheck everything, and everything seems fine. If I held the bar in place it worked, but unsupported it kept disengaging. By this time I am upset and put all the small parts back in their bags, throw the pistol back together less small trigger parts, and back in the holster. Can anyone shed some light on this please? What to do, have to change, ect. I can post detailed pictures if needed. Thanks for all feedback!