I currently have no SO but I always wanted tandem so I would be real tempted to jump on it.
I do agree it seems it was not as well cared for as I would expect but to some people a bike (even a nice tandem possibly bought 2nd hand) is just a bike or a summer recreational item akin to a lawnmower.
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“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
Sugar "Kane" Kowalczyk