I'd rather bring back this old thread than start a new one on the same subject... I ordered all the parts Farrar posted from Mcmaster-Carr to put the turnbuckle on my alternator, and at it's shortest adjustment, it was still too long to fit. (My alternator is from DMC CA)

I measured the stock bracket while installed, it is approx 3.5" from the center of each of the bolt heads when the belt is at tension.
That is not much, and the turnbuckles I can find are longer than that at the shortest position.
Has anybody used a shorter turnbuckle?