Hello Potters, I wanted to let you know that my son Xavier has made for us the missing pins on the Giffin Grip system for trimming pots. We now have a full set of three pins from 2″ to 6″. He will be making us a set of 7″ pins soon. This is a very handy device for trimming pots but unfortunately they only fit on the wheel heads of the white Shimpo wheels. There are two Giffin Grips, the one that uses the pins has holes in the three brace parts for the pins. The other Giffin Grip is for low profile pieces like plates and bowls. Let me know if you need a demonstration on how they work.