These tubes are really handy for just about all spears, and polearms like nagynatas that aren't too wide or curved. Others, like halberds, ronconi, and the like, are problematic due to the width. But you can still use the PVC tube to "armor" the shaft area, then run a couple pieces of wood to brace the sides of the head, extending down the shaft a ways, following the principle that Artzi used to reinforce the Chinese bow. You have to "build" a heavy cardboard or thin plywood casing to enclose the head where it comes out of the tube, but if everything is strong and tight, there should be no worries. I'm a great believer in Gorilla Tape to hold things together.
The trick is to protect sharp points and corners on weapons that don't come with scabbards. Corks, or wrapping with a strip of cardboard plus lots of tape and a prayer, are NOT foolproof. The sides and end of the casing need to be protected with wood covering any possible area that the tip can move and poke out.
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