It's a little tricky, having three hands might help. Assemble the pawl and spring onto the gear and shaft. Slide the shaft over a little so that it's end is not protruding from the pawl. When lowering the assembly into the case, stop half-way in and hook the end of the spring onto the crankcase as in the pics above. Then use your screwdriver to push the pawl down under the horizontal pin in the crankcase, then lower the shaft the rest of the way in and push it sideways to slip it into the bearing in the crankcase.
mystic_1