[Trevor]

"Winston" wrote in message
...
Casting a piston to the inside of the ear
canal and then removing it is gonna cause
a significant vacuum. Sounds painful, at least.
At worst, a burst eardrum and inner ear
infection? Ewww!

Nope, that's how ear moulds are made for hearing aids, and custom fitted
IEM's. Of course one should probably know what they are doing before
attempting it.

Trevor.