I'm installing a firewood rack outside, and want for one side of it to stand on a large stone we have there.
The boulder is irregularly shaped and the metal legs of the rack may slip off -- so I'd like to make depressions in the rock for the legs. The depressions need not be very deep -- I think, half of an inch would do.
I tried applying a chisel with a hammer, and got nowhere -- just a little bit of rock dust flying off. I think, the rock is too hard.
Are there any alternatives? I thought of applying a drill with diamond-tipped "circular saw", but that -- even after I cut a circle -- would still leave the inside of the circle in place, because I'm not going through the rock.
I'm sure, this is a solved problem already -- what's the solution?