To hold the centerline on the workpiece will help the device shown in the figure.
Recommend to read
HOW TO ACHIEVE THE STEREO EFFECT
Music lovers understand the interest shown by people of different ages and professions to all new in the field of stereophony. The development of electronics and improvement on the basis...
TO HELP MUSIC LOVERS
Widespread, cassette radio. Storage cassettes make a simple stand as shown in the figure.