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Although the tools below are sold through Amazon. They are the same as the stone carving tools that I personally recommend to my students for carving with Oamaru stone.
These benches are height adjustable which makes them perfect for stone carving. I own the Ryobi workbench and love it, but unfortunatlly it is only sold through Amazon's UK store for people that are wanting to buy it online.
Stanley: Surform Shaver
This is a must-have tool for shaping large areas of Oamaru stone
These are smaller files that are designed for the parts of your sculpture that are difficult to get at. They are also an essential set of tools
Crosscut Hand Saw
This type of crosscut hand saw is my recommendation for cutting Oamaru stone
A very handy saw. Mosty used for sawing after a hole after it has been drilled into the stone.