SuperDeal Wet Dental Model Trimmer Abrasive Disc Wheel Gypsum Arch JT19 Lab Device Pro 110V This powerful trimmer comes with low noise Connect the waste-disposal tube to the unit Connect one end of the water tube to the nozzle of the wet model trimmer and the other end to the tap, open the valve Connect the power cord, and switch on the power switch (O=off, l=on) When braking, it is normal to hear clicking before the sand tablet stops. If the sand tablet makes unusually loud noises, remove it, and use the included hex-wrench to adjust the screw on the back cover (18) To check if you need to replace the abrasive disk, rotate the disk by hand and estimate: if the platform jumps more than 2mm, change the disk. After replacing the disk, make sure to tighten the ring on the platform 8 (closest to the outside of the sand tablet)