Hey dewd,
When you stand on your head, do you put the weight on a flat part of your head, or on your crown where the channel opens to the heavens ?
I've got a funny shape head, where my crown seems to be kinda sharpened, like "man, its fooly fahglee head !!". But makes it difficult for me to stand on my head confortably for long.
Even on carpet, feels like the skulls gonna crack. Just trying to perform one of the yoga poses one of the monks taught me.... hahahah having lots of trouble.