On 2015-07-30 01:19 AM (-4), Cousin Ricky wrote:
> At first glance, it appears your problem is coincident surfaces.  The
> ends of the inner pipe are in exactly the same planes as the ends of the
> outer pipe.

That should read inner CONE and outer CONE.  (I shouldn't be responding 
to questions after being awakened from a sound sleep.)

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