A rotary cutter for a mower has a cord for cutting grass and the like by rotating itself; a reel for housing the cord and feeding the cord while intermittently rotating; a case for housing the reel; a cover for covering the case; and a pressing body protruding from the case. The braking device individually adjusts braking forces that are respectively generated at wheels of a vehicle. The actuating rod may be coupled to the control device via a guide piece rotatably mounted at two points in an outer actuator lever. The invention also provides a surgical fastening device and a method for attaching a surgical fastener to a site of a body tissue.