module groovemount(){

difference(){
translate([-12,-35,0])cube(size=[29,70,12], center=false);

translate([-10,0,5])cube(size=[20,12.5,15], center=true);
translate([-10,0,5+4.4])cube(size=[20,16.5,10], center=true);

cylinder(h=20, r=12.5/2);
translate([0,0,4.4])cylinder(h=20, r=16.5/2);
translate([0,-25,0])cylinder(h=20, r=5/2);
translate([0,25,0])cylinder(h=20, r=5/2);
}
}

groovemount();