I needed to make a mortising jig to use with a plunge router and guide bushing. Due to the size I needed it would be used only once so I didn't want to spend a lot of time making it. I had just received the latest edition of Fine Homebuilding magazine and one of the articles was about making such a jig with a sliding compound miter saw. The author just drew the outline of the needed opening in the center area of the jig/template board, set and locked the saw blade over the center area of the board and made 4 plunge cuts on the outline lines. Quick and Easy.