A latch is not a turnbuckle, and no ironmonger's apprentice would confound the two.
When the correct adjustment has been secured, the turnbuckle must be locked to prevent it from unscrewing.
Grasp the turnbuckle with a pair of tongs and place the end in the fire.
turnbuckle—A form of wire-tightener, consisting of a barrel into each end of which is screwed an eyebolt.
Wire, Locking—A wire used to prevent a turnbuckle barrel or other fitting from losing its adjustment.
Make two collars out of wrought iron, the size depending upon the size of the turnbuckle.