difference()
{
    union()
    {
       rotate([0,0,90])mango(5);
       mango(5); 
    }
    union()
    {
        cylinder(d = 14.5, h = 30, $fn = 6, center = true);// hueco tuerca
        translate([-25,0,1.5])letras();
        translate([25,0,1.5])letras();
    }
}

module mango(altura)
{
hull()
    {
        cylinder(d = 30, h = altura, $fn = 50, center = true); // cuerpo principal
        translate([30,0,0])cylinder(d = 16, h = altura, $fn = 50, center = true); // punta mango
        translate([-30,0,0])cylinder(d = 16, h = altura, $fn = 50, center = true); // punta mango
        translate([30,0,0])cylinder(d = 18, h = 1, $fn = 50, center = true); // punta mango
        translate([-30,0,0])cylinder(d = 18, h = 1, $fn = 50, center = true); // punta mango 
    }
}

module letras()
{
    linear_extrude(height=5, convexity=4)
                text("12", 
                     size=10,
                     font="Bitstream Vera Sans",
                     halign="center",
                     valign="center");
}