Is there any general rule-of-thumb for the amount of rate adjustment that comes with a full turn of the Brocot adjuster in your average shelf/mantel clock? A minute a day? A minute a week? Or no general rule at all.
I can't answer your question bangster, but I can say that none I have had ever adjust the same amount per turn. In fact, I fit an adjustable pendulum bob to the American mantel clocks I have that are fitted with Brocot adjuster. I find them very poor at making fine adjustments. Or maybe it's just me who is poor at using them:bang: