$fn=72;

Di=54.5;
Da=60.0;
H=35;
  X=2;


difference() {
  union() { 
    cylinder(d=Da, h=H, center=true);
    translate([0,0,-(H-X)/2]) cylinder(h=X, d=Da+6, center=true);
  }
  cylinder(d=Di, h=H+0.01, center=true);
  translate([Da/2,0,0]) rotate([30,0,0]) cube([Da,1,2*H+0.01], center=true);
}