Jim, the holes don’t go all the way through, so can only be filled from the outside.
Eric, there will be “things” in the holes, using clear so they will be visible.
Lazyman, a couple of good points you raise. I like the idea of sealing the sides of the holes. Also, you really got me thinking about using vacuum food saver bags and space bags too. I’ve been looking for an old pressure cooker I could use for pressure or vacuum, no luck so far though.
Great thoughts from all of you gentlemen, I appreciate it.