Steve, since the discussion is on the headspace Eliminators, I have a question. The instructions say when you are pulling the vacuum, to do it until the pump strains a little. I've done quite a few now and it only takes a few seconds for the bulb to compress, but I have waited as long as a minute without hearing any kind of bog down of the pump. I don't want to hurt the pump and it would seem there must be a good vacuum in there, but should I wait longer? The one way valves seem to hold well and there is always a "pop" when I get around to removing the Eliminators.I did flood the additional headspace with some additional CO2 prior to pulling a vacuum.