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stow-blade

stow-blade Mining.
  Also stoblade.
  [f. stow n.2]
  Each of two upright pieces of wood, a foot in length, connected at the top with the sole-trees of a stow or stowce.

1681 [see stow n.2 1]. 1747 Hooson Miner's Dict. K 1, Two Irons..are put into each end of the Turntree, and run in the Slots of the Stoblades. 1851 Tapping Manlove's Customs Lead Mines Gloss. 33/1 Two upright pieces of wood called stow-blades, about one foot long, [etc.].

Oxford English Dictionary

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