For the swords, you could take the wheels of some casters and place a plastic sword with the handle removed where the wheel would be and then put a new machine screw threw and use a nylock nut to hold it in place. Attach the casters to a couple of rings, or more practically adjustable straps. Then use cloth wrapped PVC pipe to create the handle. To keep it secure, cut a U for the pvc to sit over the blade, and put another machine screw with nylock nut threw it. Locking them back could be tricky, but with a plastic blade, magnets may be strong enough. You could also use a sliding mechanism by adding a block on the base of the caster, and milling an oval for the blade to slide back and forth, so the blade can be pushed down and be locked in place and pulled out to be loose. A more secure method would be to use a second hole and a pin to hold the blade back.
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