John wrote:

Freeze it with liquid nitrogen, then drill the holes. You could try just
putting it in the freeze depending on the type of rubber compound. or
just wait a couple of weeks and put it outside.


I'm curious if dry ice would be good enough? Somewhere I saw a design to make dry ice
using compressed CO2. Wish I could find it now. We have CO2 for welding that I could
tap.

Wes
--
"Additionally as a security officer, I carry a gun to protect
government officials but my life isn't worth protecting at home
in their eyes." Dick Anthony Heller