include <BOSL2/std.scad>

d1 = 38;
d2 = 41;
h = 10;

d_top = 50;
h_top = 7.5;

r = 7;
t = 2;

$fn = 360;

diff("r") {
    cyl(d1=d1,d2=d2, h=h, anchor=TOP);
    cyl(d=d_top, h=h_top, anchor=BOTTOM);
    tag("r")
    up(h_top) xrot(90)torus(r,t);
}