// yagi support parts for dir & ref elements 
// JP Hare, 01 June. 5th 2020, version 1.1

// 
difference () {
cube([40,30,30]);


// hole for boom
translate ([15,15,-1])
rotate ([0,0,0])
cylinder (h=55, r=10, $fn=90);

// hole for 4mm di element
translate ([30,40,10])
rotate ([90,0,0])
cylinder (h=55, r=2, $fn=90);

// self-tep screw holes for boom 
translate ([-25,15,20])
rotate ([0,90,0])
cylinder (h=80, r=2, $fn=90);

// self-tep screw holes for element I 
translate ([25,5,10])
rotate ([0,90,0])
cylinder (h=20, r=2, $fn=90);

// self-tep screw holes for element II
translate ([25,25,10])
rotate ([0,90,0])
cylinder (h=20, r=2, $fn=90);

}