Saturday morning in Rincon has a sound to it, and a good share of that sound is engines turning over one street after another. MOW-TOWN Lawn Care adds its own verse — block by block, mowing, edging, trimming, then the blow-off that leaves a driveway looking swept. The neighborhoods off Weisenbaker Road run to wide flat lots, and there is a genuine rhythm in taking them in order, one clean rectangle at a time. By the time the real heat arrives the route is finished and a whole street reads tidy end to end. Springfield, Guyton, Pineora and Eden come around on the same rotation.