union()
{
difference()
{
import("C:\\Users\\nebarnix\\Downloads\\Second.stl");
difference()
{
translate([-7,13,3])cylinder(h=8,d=21,center=true);
translate([-7,-21,3])cylinder(h=8,d=56.3,center=true);
}

}
translate([-7,-21,1])#cylinder($fn=100,h=2,d=56,center=true);
}