08-06-2014, 10:29 PM
Use a Rotabroach drill set- aggressive teeth at low rpm., plus it has a centering point built into it. Found a set at snap on . com. works great, use a $3 deburring tool to finish the inside-from the outside. I drilled my 6 yr. old AA carbon fiber unit - looks fine. Yes a small amount of fine grit dremel action is needed- so easy.