We went out to install some stud mounted Gemini letters on an interior cultured stone wall. We have done this before and while it took some time to get everything level, we got the letters up no problem. However, with this wall, when we drilled the hole and pulled the drill bit out, the rock would come off as well. Obviously, this won't work, so I am wondering if anyone has any other ideas or ways that they have dealt with this issue? I was thinking of incorporating a pan face panel behind the letters or maybe an acrylic standoff, but I am worried this will not alleviate all issues.