$fn=100;
trans_dist = 107;

height = 2.81;
union(){
    translate([-trans_dist/2,-trans_dist/2,0]){import("Dial_v3.3.STL");}
    translate([0,0,2.84/2]){
        difference(){
            cylinder(r=97/2, h=height, center=true);
            cylinder(r=20/2, h=height, center=true);
        }
    }
}