How would you define slip fit? As is it slides onto the spindle, it's not loose like there's any play but it can be turned by hand. Seems like it's good to go as is.
Slightly undersized spindles with a loose inner bearing race seems to be the case on my '31, the race for inner bearing turns smoothly on the spindle. A very experienced club member said the spindle and bearings were in good shape, but he recommended peening the spindle at three points around...