$fs = 0.5;
$fa = 10;
module sfr04(hole=0){
	translate([0,0,-3])	
		difference(){
			union(){
				translate([0,0,14.8]){
					color([0,0.8,0])
						cube([45,20,2],center=true);	
					color([0.8,0.8,0.8])
						for(i=[-3.75,-1.25,1.25,3.75])
							translate([i,9,3]){
								cylinder(d=1,h=4,center=true);
								rotate(a=[90,0,0])
									translate([0,2,-2])
										cylinder(d=1,h=4,center=true);
							}
				}
				for(i=[-1,1])
					translate([i*13.5,0,6.9])
						color([0.8,0.8,0.8])
							cylinder(d=16+hole,h=13.8,center=true);
				hull(){
					for(i=[-1,1])
						translate([i*3.75,-7,13])
							color([0.8,0.8,0.8])
								cylinder(d=4+hole,h=2.5,center=true);
				}
			}
			union(){
				for(i=[-1,1])
					translate([i*20,i*-7.5,0])
						cylinder(d=2,h=40,center=true);
			}
		}
}

sfr04();