I have a Savage Mark II BV (laminate stock with bull barrel) but I can only get a chin weld on the stock when looking through the scope. I'd like to install an adjustable height comb so I can play around with the height and also be able to move it down to remove the bolt for cleaning. The upside-down U kydex style appeals to me and I watched a few installation videos but they were just winging it with a hand drill and I'm worried about drilling the holes crooked if I try it that way. I have a decent drill press and basic fixturing tools but there's like no 0 degree or 90 degree flat surface on the rifle to reference. How do the gunsmiths do it?