Balsley worked with Volquez on two key issues during his side session -- shortening his long stride and also helping him find a steady arm slot to deal from.
"We just wanted to calm down his lower half and get a more consistent arm slot," Balsley said. "With the lower half, it's getting him not to over stride."
To accomplish as much, Balsley had Volquez wear shoes that had plastic spikes and not metal ones, the kind Volquez would normally wear during a start. While the metal spikes provide more firm footing, the plastic ones forced Volquez to really concentrate on his lower half and not over striding.
Balsley said he won't go as far to ask Volquez to wear the plastic spikes in a game, since hasn't done so before. Hopefully, Balsley said, some of the between-start fixes will take hold.
"Hopefully, if he repeats his delivery, he'll be fine," Balsley said.
Corey Brock is a reporter for MLB.com. Keep track of @FollowThePadres on Twitter. This story was not subject to the approval of Major League Baseball or its clubs.