Robuta

https://www.leevalley.com/en-us/shop/tools/hand-tools/marking-and-measuring/compasses-and-trammels/101542-veritas-pencil-tip

https://www.leevalley.com/en-ca/shop/tools/hand-tools/marking-and-measuring/compasses-and-trammels/73036-veritas-trammel-points

https://hillbillydaiku.com/gallery/build-galleries/trammel-points/