83 Honda 200e part question.

[catphe10]

Hello, I am rebuilding a 83 200e, and i am in the process of changing rear axle bearings and seals, where i ran into a part called "COLLAR, RR. AXLE CENTER" part number:42621-958-000.
Can someone please educate me on what this part is for and why its needed?
Thank You,

[86125m]

That is a very important piece it keeps the bearings from breaking under pressure when you tighten the axle nuts.