$fa=1;
$fs= 0.4;

$fn = $preview ? 64:360;

difference() {
    cylinder(h = 150, d = 152.4, center = false, $fn = 100);
     translate([0, 0, -1])
      cylinder(h = 202, d = 146, center = false, $fn = 100);
    
    }
    
    
  //91 mm high
    translate([0,-22,61])
        rotate([90, 0, 0])
            cylinder(h = 7, d = 122, center = false, $fn = 100);
            
            
 
 translate([0,30,61])
    rotate([90, 0, 0])
       cylinder(h = 50, r2 = 61, r1=46, center = false, $fn = 100);
       
       
 translate([0,30,61])
    rotate([90, 0, 0])
       sphere(r=42, center = false, $fn = 100);