As to the friction nut, somewhere along the way, cub changed from a design that used a pinch bolt around the lower bushing to the design with the friction washer and the nut. I'm not sure when they changed, but it was after 1972. Yours may have the older design with the pinch bolt that may need to be tightened a little. Cub says in their parts look-up to update the older design with the newer design if parts are needed, so yours well could have been updated. I would appreciate if someone would clue me in as to when that change took place.
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Matthew B 
1972 129 w/hydraulic lift and head light option soon to be repainted
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