First, clean the surface of the potter's wheel thoroughly. Small pieces of any debris on the wheel head or the disc can cause an up and down wobble, and that will be transferred to to what you are grinding.
Firmly attach the included special zinc plated low profile bat pins to the wheel head if you purchased the 1/8" + thick disc. Regular bad pins will not work with the 1/8" + disc because they will stick up above the surface of the diamond disc. The thin low profile of the grinding discs keeps water in the splash pan during use. The two holes on the disc will not interfere with the grinding operation. If you are grinding an edge, avoid the holes, and use the interior part of the disc until the edge is smoothed off. This takes just a few seconds. You can also use a 1/8" bat underneath the grinding disc and use your regular standard bat pins. Use regular standard bat pins with the 1/4" thick discs.
Place the diamond grinding disc onto the attached pins, just like you would a throwing bat. It has a coarse/medium side (120 grit) and a fine side (400 grit).
Use water with the disc. It is best to use a steady, continuous drip of water. Clean the disc with soapy water and a stiff brush occasionally to remove compacted material from between the diamond particles. It is a good practice to rinse the disc well, quickly brush it, and remove it from the wheel head, dry it off and put it away after you use it.
The diamond particles are much harder than any ceramic, and the discs should never completely wear out. They do, however, over time become “dull” because tiny pieces chip off and leave a less sharp cutting edge. This can be remedied some by reversing the direction of the potters wheel for an hour or two of use from time to time, thereby using a different edge on the diamond particles. A worn disc can be "dressed" by rubbing an aluminum oxide or silicon carbide dressing stick back and forth along across the stationary disc, creating new edges on the worn diamonds and removing some of the electroplated nickle bond, exposing more diamonds. This can all lengthen the life-span, but the discs will eventually have to be replaced.
The discs may develop small rust spots after use. This is normal, and cosmetic only, and does not affect the function. They can be removed with Naval Jelly (phosphoric acid) if you wish.
The photograph at the bottom of this page shows a large chip in the bottom of a vase before and after it was ground away.
TIPS FOR USING THE DIAMOND SATURATED POLISHING PADS