BBs hit bull's-eye for dowel-hole placement
Precisely locating dowel holes in matching pieces with curved shapes will help you produce a properly fitted project. Here's a method that's quick and accurate.
First, mark the centerpoints of the dowels with an awl. Then, tap BBs slightly into each awl mark. Place the corresponding curved top piece precisely on top of the first one and tap with a rubber mallet. When you separate the two wood pieces, the BBs will make dowel center marks that match exactly.
—Bernard Paumier, Baltimore, Ohio