// 5 cm
translate( v=[-25,0,0] ) {

rotate( v=[1,0,0], a=90) {
translate( v=[0,0,-2.5]) {
linear_extrude(height=5) {
    polygon( points=[[0,0], [40, 0],[0, 40]], paths=[[0,1,2]]);
}
}
}
difference() {
	linear_extrude(height=5) {
		polygon( points=[[0, 30], [0, -30], [60, -10], [60, 10]], paths=[[0,1,2,3]] );
	}
	translate( v=[50,0,0] ) {
		cylinder( r=4, h=6);
	}
}
difference() {
translate( v=[-5,-30,0] ) {
	cube( size=[5,60,50] ); 
}

rotate( v=[0,1,0], a=-90 ) {
	translate( v=[20,20,0] ) {
		cylinder( r=2, h=6 );
	}
	translate( v=[20,-20,0] ) {
		cylinder( r=2, h=6 );
	}
	translate( v=[40,20,0] ) {
		cylinder( r=2, h=6 );
	}
	translate( v=[40,-20,0] ) {
		cylinder( r=2, h=6 );
	}
}
}
}