Insert the middle shaft into the bottom of the outer shaft, making sure that the pin is sticking out opposite the lower hole in the outer shaft.

No matter, the pin from the inner shaft is going to pop out through that hole.

Press that pin in so the middle shaft sticks out the top of the outer shaft. Heck, also get the inner shaft to stick out the middle shaft. Luckily, getting the middle shaft through the upper bushing was easy.

You may need to put the wire plunger into the inner shaft and press it down while pulling up on the inner shaft. Hey, did you notice how easy it was to press that plunger down now that you've lubricated things?