--- /dev/null
+eps = 0.01;
+infty = 100;
+
+tube_d = 12;
+body_h = 18;
+wall = 2.5;
+spring_r = 1;
+n_spring = 5;
+
+difference() {
+ cylinder(r = tube_d/2 + spring_r + wall, h = body_h);
+ translate([0, 0, wall]) difference() {
+ cylinder(r = tube_d/2 + spring_r, h = body_h);
+ for (a = [0:360/n_spring:360])
+ rotate([0, 0, a])
+ translate([tube_d/2 + spring_r, 0, 0])
+ scale([1, 2, 1])
+ cylinder(r = spring_r, h = body_h + eps, $fn = 8);
+
+ }
+}
+