Examples from the Web for turnbuckle
Wire, Locking—A wire used to prevent a turnbuckle barrel or other fitting from losing its adjustment.
Turnbuckle—A form of wire-tightener, consisting of a barrel into each end of which is screwed an eyebolt.
When the correct adjustment has been secured, the turnbuckle must be locked to prevent it from unscrewing.
A latch is not a turnbuckle, and no ironmonger's apprentice would confound the two.
Grasp the turnbuckle with a pair of tongs and place the end in the fire.The Library of Work and Play: Working in Metals|Charles Conrad Sleffel