Hi, I seem to be getting Coincidence serface 
 problem with an object and a difference.

The cylinder is leaving traces behind at the rotation of 230, but if
rotated at 270 then the traces disapear, at 210 they are there, but less
visiable.

Any pointers to whats happening?

#local drive = union
{
	difference
	{
		lathe
		{
			cubic_spline
			11 <0,0>,<4,0>,<6,1>,<7.3,4>,<7,5.7>,<6,6.3>,<7,7.2>,<5,8>,<4,7>,<4,0>,<0,0>
			texture 
			{ 
				Cowling
			}
			rotate <0,0,-90>
		}
		cylinder 
		{
			<1,0,0> <7,0,0> 4.35
			texture 
			{	 
				PropGear
			}
		}
	}
	torus
	{
		6.6,0.7
		rotate <0,0,90>
		translate <6.3,0,0>
		texture 
		{ 
			MountRings
		}
	}
}

#declare deep1 = union
{
	object {drive rotate <0,-230,0>}
}

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