A tool head for a motor-driven, manually guided implement for receiving a rotatable cutter tool is provided. The starter apparatus includes a starter control circuit, a current sensing circuit and a signal converting circuit. An outer cover surface of one section of the hub, which faces the camshaft, is designed as a bevel surface which protrudes from the camshaft adjuster and can be brought into contact with a complementary bevel surface of the end of the camshaft.