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);
				
	}
}