Pasted

module test(){
    cylinder(8,10.5,12);
    translate([0,0,8])
    cylinder(8,12,10.5);
    }
    difference(){
    test();
         translate([0,0,3])
        cylinder($fn = 6, r = 3.5, h = 10);
        cylinder(3,9,9);
          }
         translate([0,0,  6.5])
       minkowski(){
        difference(){ 
             cylinder($fn = 6, r = 3.5, h = 1.0);
           cylinder($fn = 6, r = 3, h = 1.0);
            }}