I've got three exterior steps made of natural sandstone. They are 6 ft wide, and 10" thick. I need to anchor a metal handrailing to them. The railing has two feet: 1/4" metal plates with 3/8" holes drilled 10" apart.
I original thought of using cammed anchors for rock climbing, but I'm worried that the force of the cam will crack my stone steps. I then thought of drilling out a hole, filling it with epoxy, and then putting some 3/8" threaded stock into the hole and letting it dry. This would provide studs on which to bolt the stairs.
If epoxy is the way to go, is there a specific product that is recommended?
How is this usually done?