It's always nice to watch someone with your skill level in a given profession. I will be practicing on limestone bolders in my yard until my first big project at the entrance to my driveway that will be numbers and a Diamond, and that plan is not sandblasted in stone at this point. These bolders are hard as rock and difficult to make curved areas of practice that look satisfactory. I have air tool that can make things go faster but if nothing else finish work by hand will be needed and it's not going as well as I'd hoped. In the future could I ask you questions about the best approach in given situations? Promise not to take up much of your time.
Very interesting to watch - but have to ask (out of genuine curiosity) Why bother with the pneumatic chisel at the end? I've cut letters in marble, and I find it a fairly straightforward stone to work in by hand. These are very big letters, so I could understand using a pneumatic tool pretty much all the way through once you've got the centre line in, but what am I missing about the choice to use the pneumatic tool to finish off (I hasten to point out that this is genuine ignorance on my part!). I do love the RA ligature!