Good luck finding a die to make the lefthand thread needed on one end of the turnbuckle! Buy a screen door tensioner, and modify the ends of it to make an adjustable throttle rod.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!