http://www.woodworkingtips.com/etips/etip102700wb.html

Simple ...cheap .... easy...

Clint Neufeld wrote:

Ron,

How is your slot size "infinitely variable"? Do you make multiple passes
with a small cutter? You don't find that more difficult than configuring a
dado set to 23/32" and hacking away with that to cut a groove for undersized
plywood?