pottery tools - Google Search
MKM Pottery Tools is an online store that has any tool one would need to work with clay and other materials.
Pots and Paint: Pottery tools
Xiem X-Bevel Cut Clay at 45 30 and 60-Degree by PotteryAndClay
Euclid's Elements & Pottery Tools. Lots of other interesting tools on the site.
After trimming the leather-hard lid to fit the jar, I throw the knob. I use a profile tool made from a piece of sheet metal to give me a precise, decorative finial.
I definitely want a few of these. Durable, eco-friendly, bamboo pottery tools.
Wisner impressed and incised his pattern into the clay, using a tool he fashioned from a hacksaw blade.
Don't know if you ever tried trimming with a jar lid before but it is a great way to hold the pot on the chuck while dispersing the pressure...