"Can you describe the way you do it ?"

Hold the sandpaper firmly on a flat surface. Apply a small puddle of saliva to it, then press the tapered edge of the blade to the paper, and execute several small circles. Turn the blade over, and do it some more.

"I heard of cheap modelers but this takes the cake. "

More to it than just cheap. A machine sharpened edge CANNOT compete with a hand sharpened one. Been into wood working, models since the early 50's, furniture etc, since the early 60's. Cut up a LOT of wood. Believe me.

Les