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You can also stack the four nuts on the bolt and bypass using the pen tube spacer. That way you can make sure they are all the same diameter. Then keep putting a different one in the end position to...

Here is my variant on making solid dome washers. I use a 2-56 bolt and nut. The inside diameter of a 2-56 nut is just about right for a 1/16 rod. I use a portion of the tube out of a Bic ballpoint...