An unusual and unique type of lock where barges entered and the lock was filled with water, the barge was then moved above the side sill and the water drained leaving the barge on the shelf and repairs could then be carried out in the dry. There was a nearby boiler which was used to bend timber into shape for use in the repair work. The Stover canal began operating in 1792 but this dock was not created until the 1860's when the transportation of granite had ceased from the Haytor area down, so the canal above the lock was only required to supply a head of water for the lower section. Ball clay was loaded on the barges further down the canal so this lock was ideal to turn into a repair dock.
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