And for the rest of us who don’t own a lathe, polish a length of 1/8 aluminum rod with metal polish. Then cut to the length you want, making as many as you need. Use a jewelers flat file to level each end. Now use a #11 blade shave out the inner area at one end on each piece. Next, stand each piece with the shaved end up; insert the point on a center punch, and give a light tap with a hammer. See pics:
Note that my stacks are quite short. If I was making taller stacks, I would try drilling a hole in a wood block, perhaps a little shorter in height than the stacks. Does that make sense? They may not be as perfect as actual machined parts, but they’re great for the diy guy.