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For a while I was purchasing garage sale bicycles & cleaning, lubing or refurbishing to flip, came across a a few single bolt seat post failures. They were all on Walmart grade fake mountain bikes with the annoying knobby tire that should never be used on pathway with a downhill trail. Have never seen any since but am no longer attempting to flip bicycles as garage sale prices have skyrocketed leaving only a few dollars in each bicycle when they are cleaned up and work as designed.