7 screw_dia = 3.5 + 0.75;
8 screw_head_dia = 8.2 + 1.0;
14 circle(r = thick/2, $fn=30);
18 d = rod_dia/2 + thick/2;
21 translate([-d, 0]) C();
22 translate([-d,-d]) C();
25 rectfromto([-d,-d-thick/2], [e,0]);
26 circle(r= rod_dia/2, $fn=50);
29 for (y= [-d, +mainheight]) {
30 translate([d, y]) C();
31 rectfromto([d, y-thick/2], [e, y+thick/2]);