$fn = 100;

difference() {
    union() {
        // Cylinder body
        cylinder(h=60, d=50);

        // Base plate
        translate([0, -15, 30])
        cube([100, 20, 60], center=true);

        // Cylinder to base joints
        translate([-20.5, -12.5, 30])
        cube([9, 25, 60], center=true);

        translate([20.5, -12.5, 30])
        cube([9, 25, 60], center=true);
    }

    // Cylinder hole
    translate([0, 0, -1])
    cylinder(h=62, d=31);

    // Screw holes
    translate([-36, -4, 30])
    rotate([90, 0, 0])
    cylinder(h=22, d=8.2);

    translate([36, -4, 30])
    rotate([90, 0, 0])
    cylinder(h=22, d=8.2);

    // Nut holes
    translate([36, -8, 30])
    cube([13, 8, 7.5], center=true);

    translate([36, -8, 30])
    rotate([0, 60, 0])
    cube([13, 8, 7.5], center=true);

    translate([36, -8, 30])
    rotate([0, 120, 0])
    cube([13, 8, 7.5], center=true);

    translate([-36, -8, 30])
    cube([13, 8, 7.5], center=true);

    translate([-36, -8, 30])
    rotate([0, 60, 0])
    cube([13, 8, 7.5], center=true);

    translate([-36, -8, 30])
    rotate([0, 120, 0])
    cube([13, 8, 7.5], center=true);
}

translate([15.5, 0, 12.5])
difference() {
    rotate([0, 0, 45])
    cube([15, 15, 25], center=true);

    translate([15, 0, 0])
    cube([30, 30, 27], center=true);
}


translate([-15.5, 0, 12.5])
difference() {
    rotate([0, 0, 45])
    cube([15, 15, 25], center=true);

    translate([-15, 0, 0])
    cube([30, 30, 27], center=true);
}