You cannot simply swap out the end caps. The armatures are different lengths, so you might as well switch out the entire S/G. I think the bushing gets plenty of loading by the torque placed upon the armature by the belt tension. In any case they do wear out, and more quickly than the bearing. Regarding the bushing cap, yes, that structure you see molded on contains a wick/weep hole system that is supposed to oil the rear shaft.
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