First thing you need to do is take your cylinder out and check to see if there are burs in the bolt notches. If there is you can use a triangle shaped needle file and remove the burs.You dont want to take anything off the insides of the bolt notches, just any burs. With the needle file it would be pretty hard to remove much any way as you wont be able to get to much anyway. You may want to wrap some masking tap above and below the notches first so if you slip it wont scratch the cylinder. Next you will need to take the bolt out of the frame and chech with it to see if it fits in all the notches of the cylinder. If it doesnt, then put the bolt back in the frame and use a sharpie and color in the side of the bolt sticking out from the frame.If you look at the link i gave you on your other post you will see that it explains that and has a few pics of it. You need to see the pics to know witch side of the bolt that needs marking. The remove the bolt again and file it where the marker is like the link shows. It wont take much that you will need to remove.After that, put the bolt back into the frame along with the trigger, hammer and the bolt/trigger spring and the half of the grip frame that has the main spring on it. Now cock the gun slowly while watching the bolt. It should pop up just slightly before the hammer comes to full cock. If that all looks good the put the rest of the gun back together and try cocking again to see if it locks up now like it should. If not then let us know and one of us will try and talk you through the next steps with how to adjust your cylinder hand and possibly more on the bolt. It may sound complicated but its much harder to explain it than it is to do it, lol.