I did the same regarding the rivets. However, I made the stocks out of two pieces of wood, made the slots to accomodate the ends of the anchors and glued them together with the anchor in situ using white glue. When dry I then proceeded with drilling the holes for the rivets and manufacturing the bands. I rubbed the burnished anchors to give them an iron look and, finally, I glued the anchors into the stocks using a 2 component glue, before wrapping the rings with thread.