I was one of the ones that responded when Ryan Gill was looking for knappers to make him preforms, he gets overwhelmed with bow/arrow/knife/point orders so he buys sets of preforms at times and then finishes them himself, and he sent me a casting of his preforms before sharpening so I use that as my go to size. It’s a little over the 2 to 1 ratio, which my knapping stuff is covered and under a foot of snow currently though or i’d gladly send it to ya! It’s nice having a 3D reference. Once it melts out I could send it to ya though if you’d like!