$fn=45;

diam1=30;
diam2=2;
ht=12;
b_ht=2;

cylinder(d=diam1, h=b_ht);

for (r=[30,150,-30,-150])
rotate([0,0,r])
translate([(diam1-diam2)/2,0,b_ht])
rotate([0,-20,0])
    cylinder(d=diam2, h=ht);