It is not on a slope. The edges are all rounded but the sides are flat. Here is another photo of the same style in better light. These were all spoken for, the purchaser wanted the wedge rough cut to shape and the wedge and scale pinhole drilled. I have the wedge double stick taped into the scales and then I wrap the area to be drilled with painters tape to protect the finish. I use a set of calipers to measure the width of the scales, half that, adjust the calipers and mark the drill point on the tape. It may sound like a lot of work to simply drill a hole, but after you spend that many hours making them, you don’t want to screw them up by drilling the hole off center.