Distant decades ago, eager for knowledge of martial arts, I brought a set of four books in a deal by a mail order company.
Three of them, on Chin-na and shuriken, I still have on my shelf. The fourth was called “Kusarigama” and was not as expected.
Rather than being about the weight and chain weapon familiar to me it was about twirling kama by means of a butt-loop, rebounding it from the shoulders, ribs and thighs.
I couldn't see how you ensured the blades arrived point first, but did think it might have been an interesting thing to try with a nightstick.
The book now goes for a hefty amount of money, and if I recall it was one of those publications rich on photos but thin on information.
Here is a video I found of some of these techniques: