[Wishful]

Thanks for the tip. I am sure that we have one of those black metal clamps around here someplace. Here we go on another scavenger hunt....
The foam rings are still considered. I will have to see what my imagination comes up with. For now I can do a half hour with the bare domes but it does leave marks. I pump before bed and the marks are gone in the morning so it isn't a necessity yet.

I have had an idea of adding some kind of pressure indicator so I can pump to the same pressure each time and when I want to increase it a bit I can see by how much. Anyone have an idea what to use?