To produce your own foam posts in a range of sizes, take an old telescopic radio aerial, separate the sections, and sharpen the leading edge of each one with a file.
Then select the section corresponding to the post you require and screw it through a foam block to remove a core of the desired size.
The screwing motion is important so that the sharpened edge of the aerial cuts through the foam. If you simply try to push straight through the foam will be torn, rather than cut, and will be useless.
When you have finished, reassemble to aerial for handy storage.
Cheers,
Angus
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