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that picture shows the fully assembled cap and shaft after the bearing inserts have been installed.

one end of the shaft will have a pocket and the other will not. screw the end without the pocket into the cap.

at this point, you should have a pocket on both ends (one in the shaft and one in the cap). insert a bearing into both. then, insert a bearing insert into each bearing.

did you perhaps screw the wrong end of the shaft into the cap?