whistles

thumbrest.scad

 1whistle_d = 25.0; // Outside diameter of your whistle
 2
 3difference() {
 4  $fn = 180;
 5  intersection() {
 6    sphere(d=35);
 7    translate([0, -7, 0]) rotate([0, 90, 0]) cylinder(h=50, d=30, center=true);
 8    cube([50, 50, 13], center=true);
 9  }
10  translate([0, 0, -15]) cylinder(h=32, d=whistle_d);
11  translate([0, -18, -12]) rotate([0, 90, 0]) cylinder(h=50, d=24, center=true);
12}