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A spontoon, sometimes known by the variant spelling espontoon or as a half-pike, is a type of European polearm that came into being alongside the pike. The spontoon was in wide use by the mid 17th century, and it continued to be used until the mid to late 19th century.
A spontoon was a kind of half-pike, a military weapon carried by officers of infantry and used as a medium for signalling orders to the regiment.
Coming down to us ceremonially, the British infantry senior NCOs used what was called a spontoon, which was a badge of office and used for dressing the lines, among other things.
“I am just now like the half-pike, or spontoon of Achilles, one end of which could wound and the other cure — a property belonging neither to Spanish pike, brown-bill, partizan, halberd, Lochaber-axe, or indeed any other modern staff-weapon whatever.”
I would like to see some company make just spontoon heads that you could attach to wire.
If I could figure out how to affix the tip of the halberd, spontoon or whatever onto the piano wire, I might try that, but I think that you will be OK if you don't.
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