@Madhoo ji, we call it VOB as we are doing it as a method to heal specific organ/illness and so mostly we use for organs only.
VK gives energy to any situation/request in same way as in VOB effectively.
however along with rotation we also do it by
simply writing on a paper and keep chanting in touch of vk placed over it.
https://www.litairian.com/easy-ways-vob/
Rotation for long time is difficult and it also cause pain & uneasiness.
Both are same effective rotations or chanting.
You can also do if you want to do rotation continuously or write on a paper and keep chanting as per your convenience.