Sandwich it between two pieces of 1/4 ply (or almost any two pieces of
wood), clamp tight and drill with your favorite bit.
Alternatively, get a piece of pipe with right OD and sharpen the end
of it with a file to make a hole punch (bevel the inside, not the
outside) Put the brass on a piece of scrap, position the pipe, and
give the pipe a good whack.
This method gets my vote.
You can also check out Harbor Freight. They usually have cheap hole punch
sets that are just like this but already sharp and heat treated. They might
be named gasket punches.
If you want to make your own chucking it up in a lathe and ro0tating it
while using a dremmel tool with a stone would make short work of the task.
About the time I had mastered getting the toothpaste back in the tube, then
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