

Fill a rubber glove with water and tie the opening, now squeeze three of the fingers and observe what happens with the remaining ones
The cardiovascular system is effectively a very long bag of liquid, if you compress one area it can no longer hold the same volume of blood, that blood needs to go somewhere else, which increases the pressure in the other areas


100% percent possible, Ive used ones that are over 100 years old that use literal needles on the play head
The only thing that really breaks on them is the old elastic wound up with a hand crack to power them (which is relatively replaceable)