I gotta ya Glen, the QB-2 or later referred to as the TF-99 is a very difficult trigger to get back together once it is apart. Especially getting the sear in place while installing the sear and spring. It can be a real pain and has been several years since I did the last one. They are a pretty rough gun with a very rough laminated trigger and sear and can be tough to work on and were the reason that I eventually quit working on the TF Series.
But.... as I recall it..............
To install it, be sure that the piston assembly is installed first because the piston will not pass under the sear even though spring loaded. There will not be enough clearance unless you raise the sear and put a sliver of a block under the rear of the sear underneath that long slot in the sear and between the action and the tiny slot that is under it and between the action when you raise the sear. Be aware that the sear pin must be removed to do that.
You need to install the sear from the front to the rear. It can also be installed from the rear but I find it harder .With it partially installed, and while it is in place and held up and centered in place the front, center the spring, sear and pin in place from the rear through the hole in the back of the action while under the pressure of the spring. It is not only difficult to explain but also just as difficult to do usually.
Hope you can make sense of this.
Bob
