Hey Dale2008, I just took one of the newlines apart, and got to the trigger part of assembly. It looks like you might have to remove other parts from the frame to easily put the trigger back in. The issue is the trigger spring, as it is pretty strong and does not let the screw holes stay lined up. The model I'm talking about is the second model with the cylinder stop bolt coming from the breech face.
Once you remove the mainspring, the hand spring and hand, the hammer will slide out the top of the frame. At this point you should have enough space to put the trigger back in. First reinstall the cylinder bolt in the frame. It just slides in the hole on the right side of the frame. Push the bolt into the breech opening. Than, insert the trigger with spring through the bottom of the frame. The trigger spring will rest on the cylinder bolt. Get your trigger screw ready to install back in place. Now use a non marring tool (I used the rubber coated handle of pliers) to push the trigger assembly towards the front of the frame, to line up with the screw hole. It helps if the revolver is held securely while doing this step. Keep pressure applied to the trigger, and holes lined up, while screwing in the trigger screw, to avoid damaging the threads. Make sure you've got your frame secured, so that it doesn't slip away while applying pressure to the trigger pieces.
Once you remove the mainspring, the hand spring and hand, the hammer will slide out the top of the frame. At this point you should have enough space to put the trigger back in. First reinstall the cylinder bolt in the frame. It just slides in the hole on the right side of the frame. Push the bolt into the breech opening. Than, insert the trigger with spring through the bottom of the frame. The trigger spring will rest on the cylinder bolt. Get your trigger screw ready to install back in place. Now use a non marring tool (I used the rubber coated handle of pliers) to push the trigger assembly towards the front of the frame, to line up with the screw hole. It helps if the revolver is held securely while doing this step. Keep pressure applied to the trigger, and holes lined up, while screwing in the trigger screw, to avoid damaging the threads. Make sure you've got your frame secured, so that it doesn't slip away while applying pressure to the trigger pieces.