Message:

<p>[QUOTE=&quot;springfld.arsenal, post: 111241, member: 54&quot;]A poster at link in my previous post explains this general type of device.&nbsp; I don&#039;t fully understand it yet but I know it only works on the parts of the problem that are in the horizontal plane.&nbsp; Vertical differences are handled separately.[/QUOTE]</p><p><br /></p>

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