//50mm width seems good in your hand
//70mm length seems good in your hand
//20mm high is more than enough

//central holen needs to be 8mm mounting hole 
//the knob is 45mm in diameter at the base


scale([.9,1,1])
{
translate([-25,0,0])
{
	scale([0.3,1.114,1])
	{
	difference()
		{
		translate([15,0,0])
			circle(d=70);

		translate([70/2,0,0])
			square(70,center=true);
		}
	}
}

mirror()
translate([-25,0,0])
{
	scale([0.3,1.114,1])
	{
	difference()
		{
		translate([15,0,0])
			circle(d=70);

		translate([70/2,0,0])
			square(70,center=true);
		}
	}
}

square([50,70],center=true);
}