The present invention discloses a method for adjusting a tilt angle of an optical disc driver. The coupon can also be used as a means to encourage people to visit specific sites as a way of promoting goods or services sold at the visited site. A wiring board is provided to connect to the input terminals of the plural sheets of flexible printed circuit boards. Preferably, the light source comprises opto-electronic elements only. The cutting edges of the reamer sections are parallel straight cutting edges or helical cutting edges.