Start the saw and slowly raise the blade until it's about 1' higher than the surface of your plywood base, steadying the plywood with your other hand (away from the blade) as needed to prevent the plywood from wandering during the cut. Place the sled into the mitre track and place the plywood directly over the lowered blade. We'll be bringing the blade up through the plywood base to create a reference cut which we'll align the back fence to. With your saw de-energized remove the insert and remove the riving knife, then place the insert back over the blade and lower the blade completely into the table. The back fence needs to be perpendicular to the saw blade and perfectly square to make accurate cuts. Before gluing on the sled back fence, which needs to be square to the blade, we'll need to make a reference cut.
