After 70 years in Golden Gate Park, about half of the stones were missing and needed to be newly carved. A Fabrication of true stone replicas in a short amount of time was required.
We purchased a basic block saw in England and used an empty monastery barn to build a workshop. The monastery metal smith built  with simple steel pipes, a radius-cutting tool, which allowed me to shape 12 to15 voussoir stones at once. For the missing columns, we found a slow turning electric motor and built a homemade lathe, using the running saw blade as a shaping tool. I shaped the large oculus openings, from single stone blocks, with a second circular cutting machine, which was also made by the monastery smith. With those simple tools and machinery, I carved and shaped all the missing stones on the monastery property, from lime stone blocks quarried in Texas.