1). Remove the five screws from top half of cassette shell. If the cassette shell halves are glued together, very carefully split the shell with a Phillips-head screwdriver. Maneuver the screwdriver around the shell to break its seal. Avoid getting cut or damaging internal components of cassette.
2).Carefully lift off the top half of the cassette shell.
3). Pull the head if the tape from the left reel.
4). cut-off the damaged edge, and attached a peice of sctoth tape to the shining side of the tape, and leave about 1/2 inches of scotch tape beyond the head of the recording tape.
5). trim the sctoch tape using single edge of the sctoch tape razor or X-Acto knife to the same width as the recording tape.
6). carefully insert and tape the head of the recording tape to the right reel. and manually wind the tape till the recoding tape is flat to the front of the recoding pad.
7). carefully close the top shell, make sure not to pinch the tape. use your finguer trun the right reel, make sure the tape winds freely.
8). secured the top with screws.