I also made these from the bulk rock i chipped out...
awesome! thank you, the grinding stone heads are scarce as hens teeth in South Africa, i can however get the granite polishing pads an different grits and solid steel diamond concrete smoothing attachments that weigh about 5lbs, this might be too heavy for my grinder but i will make a plan.
a note on what you want to do. make sure your rock is heat resistant... i am not familiar with that type of rock as we do not have Flint rock in South Africa or don't have it in large enough quantities for me to have ever come across it. Slate we have a lot of, but that stuff explodes if exposed to high heat... so phone your geological society and ask the right questions.
takes about 4 solid hours to complete, given the rock is not too hard or you have a large grinder.
I added a suggestion of dust mask for the dust created...
lol no worries mate
DIY Basin/birdbath From Stone
DIY basin/birdbath from stoneView Instructable »