If you want to chance removing the sideplate again, the bolt sits on the right side (on top) of the trigger. The rear has a sort of a half moon shape and the top right goes through a slot in the frame and into the front cylinder notches. The bolt spring is a kind of "U" shape that goes into a slot in the bottom of the bolt then curves up around the bottom of the bolt to the rear and bears on the rebound lever.
Here is a picture. The top arrow points at the bolt, the bottom one at the bolt spring. You can see the tip of the bolt sticking up through the bottom of the cylinder window in the frame.