module rplate(w, d, h, r=1) {
  hull() {
    for (x = [0, w-2*r]) {
      for (y = [0, d-2*r]) {
	translate([x+r, y+r, 0])
	  cylinder(h, r, r);
      }
    }
  }
}

module mbolt(m=3, d=10, h=5.4) {
       cylinder(d, d=m, d=m);
       translate([0, 0, d])
	 cylinder(1.8, d=h, d=h);
}

module qround(h, w) {
  intersection() {
    cylinder(h, r=w);
    cube([w, w, h]);
  }
}

function avg(x, y) = (x+y)/2;