This is a re-assembly tutorial for the Diana T05 trigger (and its clones - Ruger Blackhawk, etc). As far as I can tell, all these triggers are configured exactly the same, so the same procedures and principles apply to all. I won’t cover the disassembly and tuning/lubing of the trigger in this thread, only the re-assembly with ‘’dry’’ components.
I’ll be using my Ruger Blackhawk T05-clone trigger as an example. The main differences with an original are that the trigger blade is made from metal, and the stock screw nut is removable. On the original T05 the stock screw bolts into threads made directly into the trigger casing, and the trigger blade is plastic.
As a starting point, there’s the T05 parts diagram and list from the diagram for a D240 T05 (available to download freely on the Diana site : https://www.diana-airguns.de/en/service/spare-parts-lists
In picture #1 you see all the parts cleaned-up and laid down, ready to re-assemble. The pliers you see in the pic will be useful for parts and springs positionning, the small one is flat-bladed and is the ideal tool for small spring work.
To begin the re-assembly, first put the 2-legged spring (#53 in the diagram) into the hook (#52), in the correct position as seen in picture #2. Then use the needle-nose pliers to install the hook/spring assy. in the trigger casing. Once in place, I like to use a small screwdriver (a toothpic would do) to keep the spring in place for the pin installation. Just push the pin in place, and you're done for that part.
Second step is to install the lower lever (#102) and its spring (#50). In picture #5 you see it from underside, picture #6 from the rear. First install the lever, then the spring. Please note the small nub on the rear of the lever, this is where the spring goes. There's also a small recess/seat for the spring, built into the casing (not visible in the pic).
Picture #8 shows the installed spring.
Next is the trigger blade. I like to ''press'' it into place with my thumb, I find it's easier to insert the pin. Then the trigger return spring is installed.