A cobble isI dunno what a cobble is, but a manufacturing defect that a reseller has to replace IS compensated for by the manufacturer. If it isnt I would say it is time to find a different manufacturer.
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Cobble may refer to:
A particular size of rock, larger than gravel
Cobblestone, partially-rounded rocks used for road paving
Hammerstone, a prehistoric stone tool
Tyringham Cobble, a nature reserve in Tyringham, Massachusetts, U.S.
Bartholomew's Cobble, a park near Sheffield, Massachusetts, U.S.
In other words...im in a cobble with my bike engine getting replaced any time soon.