"Backlash is undesirable in precision positioning applications such as machine tool tables. It can be minimized by tighter design features such as ballscrews instead of leadscrews, and by using **preloaded** bearings. A **preloaded** bearing uses a spring or other compressive force to maintain bearing surfaces in contact despite reversal of direction"
Abstract from Wikipedia, see link

Bt the way, as you probably already know "gioco" in this context is "Backlash"