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Interesting observations. Both (pre beater bar) brushrolls in my Hoover "Baby" 103 and 105 have perforated endcaps and ball bearings. I was told that these were rebuilt and "modernized" at one point, as they originally used wooden bearings! Since these tufted brushrolls are of course a smaller diameter, there's no real "end" insert like the beater bars; the bearing simply fits into each end of the brushroll itself.