to rig a purchase

from The Collaborative International Dictionary of English v.0.48
Rig \Rig\, v. t. [imp. & p. p. {Rigged}; p. pr. & vb. n.
   {Rigging}.] [Norweg. rigga to bind, particularly, to wrap
   round, rig; cf. AS. wr[imac]han to cover.]
   1. To furnish with apparatus or gear; to fit with tackling.
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   2. To dress; to equip; to clothe, especially in an odd or
      fanciful manner; -- commonly followed by out.
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            Jack was rigged out in his gold and silver lace.
                                                  --L'Estrange.
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   {To rig a purchase}, to adapt apparatus so as to get a
      purchase for moving a weight, as with a lever, tackle,
      capstan, etc.

   {To rig a ship} (Naut.), to fit the shrouds, stays, braces,
      etc., to their respective masts and yards.
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