98, is necessary.
Every alternate tooth is bent in the direction of its set by the plunger in the instrument pushing against the anvil, which is an adjustable eccentric disc.

After the saw is set, it is filed.

This is done with a triangular file, Fig.

144, p.

90, which is held in the right hand and its point in the thumb and fingers of the left.
Pressure is applied only on the forward stroke, which should be long and even, the file being raised above the tooth on the return stroke.
The file should cut in the direction of the set, that is, the teeth having the set away from the worker are filed first.