Here are a couple of photos I have of another one I had apart. It looks the same as yours.. I believe that the small round piece goes in after the spring,
with the cupped part facing up so the small bearing can sit in it.
So the order would be spring——-small cupped piece—–small bearing, then the shaft. Then put in the three large bearings. [that is the challenge and the hard part]. I hope this make a difference.. Email me with the results, as it is hard to find my posts on this forum. .
Dan Walker in Calgary.