Always be sure your drill is set to the highest speed and lowest torque and the drill bit is in the bushing before powering up the drill and contacting any wood surfaces.
Store your biscuits in a cool, dry place to prevent swelling. If you find that your biscuits have swollen, due to moisture, place in oven on low heat (150° to 200°) for 30 to 60 minutes to extract the moisture that caused the biscuit to swell.