Some years ago I took out the single trigger in a Valmet 412 and replaced it with factory double triggers. Now I'd like to put the single trigger back and can't seem to figure out a way to get the parts back in. I have a set of instructions on installing the double triggers, but nothing on reinstalling the single trigger. I also have an exploded drawing of the parts. I know where things are supposed to go but just can't get them in place. Any ideas?