difference() {
	scale( v=[1,0.25,1] ) {
		translate( v=[0,0,2.5] ) {
			cylinder( r = 35, h=5, center=true );
		}
	}

	union() {
		union() {
			translate( v=[-15,0,3] ) {
				cylinder( r = 3, h = 6, center=true ) ;
			}
			translate( v=[15,-3]) {
				cube( size=[20,6,6] );
			}
			translate( v=[15,0,3] ) {
				cylinder( r = 3, h = 6, center=true ) ;
			}
			translate( v=[-35,-3]) {
				cube( size=[20,6,6] );
			}
		}
	}
}