Turnbuckle: A double-ended eyebolt with a left and right-handed thread in the central nut. A turn of the latter draws both bolts together, thus increasing the tension in the rod or wire to which the turnbuckle is attached.
Flexible wire cables are attached to vertical stabilizer, and turnbuckles are used to align and tighten cables. The vertical stabilizer is further aided in its alignment by the bolt clip at its toe and by the double clip at its heel.
Pitch StrutParallelism between the prop shaft and the engine shaft is maintained by adjusting a turnbuckle within a rubbermounted strut, ...
Turnbuckles are often used to tension the wires. In the early days of aircraft design the biplane with bracing wires and struts was the strongest design. The disadvantage of bracing wires is drag.
They should be tight and the turnbuckles should be well safety wired. Another point at the fuselage nose is the anchorage of the wind drag bracing, or the drift wires as they are called.
The assembly includes the necessary connectors, turnbuckles, in-line energy absorbers, shackles, etc. and may include intermediate anchorages.
On a Piper Cherokee, the roll-wise trim is easily adjustable on the ground — in the flap extension mechanism for each flap there is a turnbuckle that allows the flap to be raised or lowered until the roll-wise trim is just right.
 See also: Propeller, Direct, Fuselage, Rudder, Plane
  
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