[. . . ] Important: For secure mounting, the screws must go into the radio to a depth of at least 3/8". If the overall length from the bottom of the cabinet shelf to the bottom of the over hand is more the 1 3/4". [. . . ] A shim can be made from a sheet of plywood, using the template to locate the central lines for drilling the 3/16" mounting holes; the shim can be located between the cabinet shelf bottom and spacers. Make sure the wood is at least as thick as the excess over 1 3/4". Longer screws (Type#10-32) are available at most local hardware stores Cut out the template on the line indicated. The template size and the screw hold positions are identical to the top of the Clock radio. Mounting Procedure Step 1. If your cabinet does not have a overhang : a) Position template in desired location on underside of cabinet, flush with front edge. If installing the unit under a wood cabinet, you may wish to countersink the drilled holes from the INSIDE of the cabinet. Step 3 Remove template and clean drill shavings from inside and underside of cabinet. Select the spacer or combination of spacers that is equal to or longer than the cabinet overhang. Installation with supplied washers (no Countersink) Step 5. The washers must be used on metal cabinets, and on wood cabinets if you did not countersink the drilled holes. Hold screw heads down while you push the selected spacers onto the screws under the cabinet. [. . . ] The washers must be used on metal cabinets, and on wood cabinets if you did not countersink the drilled holes. Hold screw heads down while you push the selected spacers onto the screws under the cabinet. [. . . ]