A Double-Duty Drilling Jig
It can be tough drilling perfectly centered holes into a hardwood ball. A jig makes this task easier, but the ball-drilling jig I saw in a recent woodworking magazine takes the long way around the barn. I've been using a simplified version (shown at above) for years, and it's never failed me.
Instead of tightening the stock in place with a small screw clamp, you also could use a carriage bolt and wing nut. I use various-size threading dies for my projects and have had trouble holding the dowels to thread them, but this jig works great for that purpose too.