Horsehead swivel chair is prone to surface chopping, chips and breaks, especially if antique, as they often are. A wooden swivel chair can develop cracks or cuts in the legs over time, and the swing mechanism may get stuck, which means getting the chair a spare part.
Spread old newspapers over the floor to protect it from tree dust and place a horsehead swivel chair on it. Put on plastic gloves. Take 320-grit sandpaper and grind the surface of the wood easily, in the direction of the grain. Sand rough or raised areas, and remove the wood dust with a brush. Fill hollows, hard cracks or splash rings in wood with wood filler. Glue lifted wooden pieces with wooden glue. Keep in place, and allow both filler and wood to dry overnight. Sand they glued the areas easily with 150-grit sandpaper. Not over sand: just do it enough to remove excessive glue residue and smooth the grain.
Repair broken horsehead swivel chair legs. Use a 1/8 inch wooden stick to attach the broken pieces. Take a 2-inch round thread nail and cut the end with a hand saw. Hammer nails halfway into the middle of the chair legs. Receive broken part and press nail. Pull apart, take a nail and drill a half inch down. Drill a second half inch in the opposite broken piece. Sand wood stick down with 150-slip paper so it fits into the hole of the opposite piece. Put a plug into the hole and fill with wood epoxilim.