Todd Seidenberg wrote:

So the question is, how do I line up the drawer suppoorts from front
to back, so that they are level, and square? Is there some trick to
it? How do I ensure that the cleats that attach to the carcass to hold
the supports are in the correct position?

Often there are jigs available to assist in the installation of the
slides. Here's one example"

http://www.rockler.com/ecom7/findprod.cfm?sku=5553

--
Jack Novak
Buffalo, NY - USA
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