Follow the steps listed below to attach the blade in the DW321 or DW933 jigsaws.
1. Lift the black handle/knob approximately ¼ .
2. Turn the handle/knob counter clockwise 5-7 full turns until blade chuck is completely open.
3. Keep the black knob pulled up as you turn it.
4. Insert T shank or universal jigsaw blades into the chuck making certain that the back edge of the blade fits into the support roller.
Please note that when using T shank blades, insert the blade to the shoulder of the shank. With the knob/handle still in the up position, turn the handle/knob clockwise until the knob starts to ratchet.
Make sure when tightening the clamp it clicks 3 times. Push the handle/knob down. The blade is completely installed at this point.