dia = 26;
avs = 7.0;
rtapp = 2.0;
htapp = 4;

color("Red", 0.5)
{

difference()
  {
  union()
  {
    difference()
    {
    sphere($fn = 50, $fa = 12, $fs = 2, r = dia/2);
    translate([-dia/2,-dia/2,-dia/2]) cube(size = [dia,dia,dia/2], center = false);
    }
  } 
  sphere($fn = 100, $fa = 12, $fs = 2, r = 7.5);
  
  translate([-avs,-avs,(htapp-1)]) sphere($fn = 30, $fa = 12, $fs = 2, r = rtapp);
  translate([-avs,-avs,-1]) cylinder($fn = 30, h = htapp, r1 = rtapp, r2 = rtapp, center = false);
  translate([avs,-avs,(htapp-1)]) sphere($fn = 30, $fa = 12, $fs = rtapp, r = rtapp);
  translate([avs,-avs,-1]) cylinder($fn = 30, h = htapp, r1 = rtapp, r2 = rtapp, center = false);
  translate([-avs,avs,(htapp-1)]) sphere($fn = 30, $fa = 12, $fs = 2, r = rtapp);
  translate([-avs,avs,-1]) cylinder($fn = 30, h = htapp, r1 = rtapp, r2 = rtapp, center = false);
  translate([avs,avs,(htapp-1)]) sphere($fn = 30, $fa = 12, $fs = 2, r = rtapp);
  translate([avs,avs,-1]) cylinder($fn = 30, h = htapp, r1 = rtapp, r2 = rtapp, center = false);
}

}