Never before seen axle question

I'm restoring a circa 1940's KIT and it has independent torsion axles. One axle is mounted forward of the other. This trailer has one working axle and the other was frozen solid. After much heat and levering with a pry bar, I was able to free the other axle, but it appears to have lost its spring.
Is anyone familar with this style of axle? Does it have rubber dampners like a modern design, or is there a coiled spring inside that rusty tube? In any case, it just squats and is moveable with no resistance. I'm hoping to find out more info on this design and whether or not it is repairable.
Any help would be appreciated.
Is anyone familar with this style of axle? Does it have rubber dampners like a modern design, or is there a coiled spring inside that rusty tube? In any case, it just squats and is moveable with no resistance. I'm hoping to find out more info on this design and whether or not it is repairable.
Any help would be appreciated.
